In der Drogerie kaufe ich außer Duschgel auch Toilettenpapier, aber heute kein Putzmittel mehr.

Because German is using verb-second word order here.

The sentence starts with In der Drogerie. That whole phrase takes the first position, so the conjugated verb must come next:

• In der Drogerie | kaufe | ich ...

This is very common in German. Compare:

• Ich kaufe in der Drogerie ...
• In der Drogerie kaufe ich ...

Both are correct, but when something other than the subject comes first, the verb still stays in second position.

Because this sentence describes location, not movement.

German uses:

• in + dative for where something happens
• in + accusative for where to / movement toward somewhere

So:

• in der Drogerie = in the drugstore / at the drugstore
• in die Drogerie = into the drugstore / to the drugstore

Here, the speaker is saying where they buy things, so dative is needed.

It is dative singular.

The noun is die Drogerie. After in when it means location, it takes the dative:

• nominative: die Drogerie
• dative: der Drogerie

So In der Drogerie means in the drugstore.

It means something like besides ... also or in addition to ... also.

In this sentence:

• außer Duschgel auch Toilettenpapier

means:

• not only shower gel, but also toilet paper
• or more literally: besides shower gel, also toilet paper

It is a common pattern for adding another item.

A close English equivalent is:

• Besides shower gel, I also buy toilet paper.

Because these are being used as uncountable/mass nouns or as general product names.

German often leaves out the article in this kind of context, just like English often does:

• I buy shower gel
• I buy toilet paper
• I buy cleaning product / cleaning supplies

So:

• Duschgel
• Toilettenpapier
• Putzmittel

are all natural without ein or das here.

If you wanted to refer to a specific item, you might use an article:

• das Duschgel
• ein Putzmittel

But in shopping contexts, article-less nouns are very common.

Because kein is used to negate a noun that has no article.

Compare:

• Ich kaufe Putzmittel. = I buy cleaning product / cleaning supplies.
• Ich kaufe kein Putzmittel. = I don’t buy any cleaning product.

Use nicht for verbs, adjectives, adverbs, or more general sentence negation. Use kein where English would often say no or not any before a noun.

So here kein Putzmittel is exactly what German normally uses.

Here mehr means any more or any longer.

So:

• heute kein Putzmittel mehr

means:

• no cleaning product today any more
• more natural English: no more cleaning product today / not buying any cleaning product today

In negative sentences, mehr often gives the idea of no longer or not anymore.

Examples:

• Ich esse kein Fleisch mehr. = I don’t eat meat anymore.
• Heute kaufe ich kein Putzmittel mehr. = I’m not buying any more cleaning product today.

Heute is a time expression, and German often places time words fairly early in the clause.

The full idea is:

• ... aber heute kaufe ich kein Putzmittel mehr.

Here heute comes before the verb phrase that is understood or omitted. It emphasizes today as the contrast:

• usually I buy it / I might buy it,
• but today I’m not buying any more.

German word order with time expressions is flexible, but this position is very natural.

Because the second part is an ellipsis: some words are left out because they are understood from the first part.

The full version would be:

• In der Drogerie kaufe ich außer Duschgel auch Toilettenpapier, aber heute kaufe ich kein Putzmittel mehr.

German often omits repeated words when the meaning is clear. So the shorter version is perfectly natural:

• ..., aber heute kein Putzmittel mehr.

The listener understands that kaufe ich is still meant.

It contrasts the earlier shopping items with what is not being bought today.

The sentence says:

• I buy shower gel
• I also buy toilet paper
• but today, no cleaning product anymore

So aber introduces a contrast: some items are being bought, but one item is not.

Because aber is introducing a new coordinated part of the sentence.

German commonly uses a comma before aber, especially when it links two main-clause-like parts or when the second part is an ellipsis of a clause.

Here the comma helps separate:

• the first buying statement
• the contrasting second part

So the punctuation is normal and helpful.

No, German allows other possibilities, but this one is very natural.

This structure highlights Duschgel first and then adds Toilettenpapier with auch. You could also say things differently depending on emphasis, for example with nicht nur ... sondern auch:

• Ich kaufe nicht nur Duschgel, sondern auch Toilettenpapier.

That is a bit more explicit and often easier for learners to recognize as not only ..., but also ....

But außer ... auch is perfectly good German and sounds natural here.

Not exactly.

For learners, this is a useful vocabulary point: German Drogerie is often more like a shop selling things such as:

• toiletries
• shampoo
• shower gel
• paper goods
• cleaning products

It is not always the same as an English or American drugstore/pharmacy. A true pharmacy in German is usually Apotheke.

So even if the meaning has already been given, this word is worth noticing because it can be a false friend.

Yes. In this context, Putzmittel is singular in form (das Putzmittel), but it can be understood quite broadly as cleaning product or even cleaning supplies, depending on context.

So:

• kein Putzmittel mehr

could mean:

• no cleaning product
• no more cleaner
• no cleaning supplies anymore

German often uses a singular product noun in a more general sense like this.