Guardamos el agua embotellada con el alimento no perecedero.

Because agua is a feminine noun, but in the singular it takes el instead of la when the stressed sound at the start is a- or ha-.

So you say:

• el agua fría
• el águila blanca

But the noun is still feminine, so the adjective stays feminine:

• embotellada
• not embotellado

In the plural, it goes back to las:

• las aguas
• las aguas frías

So in your sentence, el agua embotellada is correct.

Because the gender of agua is still feminine. Only the article changes to el for pronunciation reasons.

So:

• el agua embotellada
• el agua fría
• mucha agua

Notice how other words that agree with agua are feminine:

• esta agua is less common because of sound, so speakers often prefer esta agua only in careful speech, but agreement is still feminine
• mucha agua
• agua limpia

The important idea is: the article looks masculine, but the noun is feminine.

Guardamos is the 1st person plural present tense of guardar.

Here it means something like:

• we store
• we keep
• we put away

In this sentence, guardar has the sense of storing/keeping supplies, not guarding in the English sense of protecting something physically.

Depending on context, guardamos could mean:

• we store (habitually)
• we’re storing (in some contexts)
• we keep

Both can work, but they are not exactly the same in tone.

• guardar is very common and everyday.
• almacenar is more formal and sounds more like to warehouse / to store.

So:

• Guardamos el agua embotellada... sounds natural and ordinary.
• Almacenamos el agua embotellada... is also possible, but a bit more technical or formal.

In normal speech, Spanish often prefers the simpler verb guardar.

Spanish often uses the definite article more than English does.

English might say:

• We store bottled water...

But Spanish commonly says:

• Guardamos el agua embotellada...

The article can refer to:

• a known supply of bottled water
• bottled water as the item/category being stored in that context

So even when English uses no article, Spanish frequently uses el / la / los / las.

Embotellada is the past participle of embotellar used like an adjective.

• embotellar = to bottle
• embotellado / embotellada = bottled

So:

• agua embotellada = bottled water

This is very common in Spanish:

• comida congelada = frozen food
• puerta cerrada = closed door
• leche pasteurizada = pasteurized milk

In Spanish, most descriptive adjectives normally come after the noun.

So:

• agua embotellada
• alimento no perecedero

This is the normal order.

English usually puts adjectives before the noun:

• bottled water
• non-perishable food

Spanish usually puts them after:

• agua embotellada
• alimento no perecedero

Perecedero means perishable.
So no perecedero means non-perishable or not perishable.

Spanish often forms this idea with no + adjective rather than always using a single prefixed word like English does.

So:

• alimento no perecedero = non-perishable food
• literally, food not perishable

You may also hear alimentos no perecederos very often, especially in emergency or food-storage contexts.

The singular is grammatically correct, but many learners notice that plural often sounds more natural in real life.

Compare:

• el alimento no perecedero = non-perishable food / the non-perishable food
• los alimentos no perecederos = non-perishable foods

In practical contexts like survival kits, donations, or storage, Spanish very often uses the plural:

• agua embotellada y alimentos no perecederos

So the singular sentence is fine, but the plural version may sound more idiomatic depending on context.

Yes, here con most naturally means with / together with.

So the sentence suggests that the bottled water is stored along with the non-perishable food.

It links the two stored items:

• el agua embotellada
• el alimento no perecedero

So the sense is:

• We store bottled water with non-perishable food.

A little, yes. Grammatically, con usually just means with, but context decides exactly how to interpret it.

Most likely meaning:

• the bottled water is stored together with the non-perishable food

Less likely interpretations are possible in theory, but they do not fit the context well. In ordinary reading, a Spanish speaker will understand it as storing both together.

If you wanted to make that extra clear, Spanish could also say:

• Guardamos el agua embotellada junto con el alimento no perecedero.

It is present indicative, first person plural.

Form:

• yo guardo
• tú guardas
• él/ella guarda
• nosotros guardamos

In context, the present tense can express:

• a habitual action: We store...
• a general practice: We keep...
• sometimes an action happening now, depending on context

Without more context, the most neutral reading is we store / we keep.

Because the direct objects here are things, not specific people.

The personal a is used before specific human beings (and sometimes animals treated as individuals):

• Veo a María.
• Ayudamos al vecino.

But here the objects are:

• el agua embotellada
• el alimento no perecedero

Since they are not people, there is no personal a.

Yes, that is also possible.

That version sounds a bit more general and less tied to specific known items:

• Guardamos agua embotellada con alimentos no perecederos.

Compared with:

• Guardamos el agua embotellada con el alimento no perecedero.

Very roughly:

• with articles: can sound more specific or like referring to known supplies/categories in context
• without articles / with plural: can sound more general or more natural in some practical contexts

Both are understandable; the best choice depends on the situation.

Yes, it is understandable and acceptable in Spain Spanish.

That said, in a practical context many speakers might more naturally say something like:

• Guardamos agua embotellada y alimentos no perecederos.
• Guardamos el agua embotellada junto con alimentos no perecederos.

Your original sentence is still correct. The most noticeable point for learners is not that it is wrong, but that Spanish often has several equally valid ways to phrase this kind of idea.