Na štandu s hranom toče vodu.

Na is commonly used with štand because a štand is thought of as a stall/stand or counter-like place, so Croatian treats it as something you are at/on rather than inside.

• na štandu = at the stall / at the stand
• u would usually suggest being inside something enclosed.

So Na štandu s hranom means At the food stall.

Because na here requires the locative case when it means at/on/in a place.

The noun štand changes like this:

• nominative: štand
• locative: štandu

So:

• štand = a stall
• na štandu = at the stall

The preposition s(a) meaning with takes the instrumental case.

So hrana changes to hranom:

• nominative: hrana = food
• instrumental: hranom = with food

That is why:

• štand s hranom = a stall with food / a food stall

In natural English, we usually do not translate this word-for-word as stall with food. We just say food stall.

Toče is the 3rd person plural present form of the verb točiti.

Basic meaning:

• točiti = to pour, to serve a drink, to dispense a liquid

So toče vodu literally means:

• they pour water
• or more naturally in context: they serve water / they dispense water

At a stall, toče often suggests pouring drinks for customers.

Croatian often leaves out the subject when it is understood from the verb ending.

Toče already tells you it is they. But in this sentence, it does not have to mean a specific named group. It can be an impersonal/general they, like English:

• They serve water there.
• They pour water at the food stall.

So the sentence can mean:

• the people working there serve water
• water is served there

Croatian often uses 3rd person plural this way.

Because vodu is in the accusative case, which is used for the direct object of the verb.

• nominative: voda = water
• accusative: vodu

Since water is the thing being poured/served, Croatian uses the accusative:

• toče vodu = they pour/serve water

Yes, here it is present tense.

• toče = they pour / they are pouring / they serve

Croatian present tense can correspond to different English present forms depending on context:

• They pour water
• They are pouring water
• They serve water

The exact English choice depends on the situation.

Yes, Croatian word order is fairly flexible.

This sentence begins with Na štandu s hranom to set the scene first: At the food stall...

Then comes the verb and object:

• toče vodu

You could also say:

• Toče vodu na štandu s hranom.

Both are grammatical. The original version puts more emphasis on where the action happens.

Yes, it is natural and understandable.

Literally it means stall with food, but in English we usually say food stall. Croatian often uses structures like:

• štand s hranom = food stall
• kava s mlijekom = coffee with milk

So even if the wording is slightly different from English, it is very normal in Croatian.

These verbs can overlap, but they are not used in exactly the same way.

• točiti = to pour/serve/dispense liquid, especially from a tap, bottle, barrel, machine, or into glasses
• uliti = to pour in, emphasizing putting liquid into something
• sipati = to pour, sprinkle, or add, often for loose substances too, not only liquids

At a stall, točiti vodu sounds natural because it suggests serving or dispensing water.

A rough guide:

• štandu: SHTAHN-doo
• hranom: HRAH-nom
  
  • hr is pronounced together; the h is clearly pronounced
• toče: TOH-cheh
  • č sounds like ch in church
• vodu: VOH-doo

Also:

• š = sh
• č = a hard ch sound

Yes. Even though the Croatian sentence literally uses they pour/serve water, English often translates this more naturally with a passive:

• Water is served at the food stall.

That is a very normal interpretation, especially when the specific people doing it are not important.