In the grocery store, you don't have to say anything except when you need to find something. Here are some sentences to find general items.

"Where is the fruit section?"
"Do you sell ice cream here?"
"Where can I find batteries?"
"Where is the toothpaste?"
"Can you point me to the medicine area?"
"Where is the bakery section?"
"Do you sell fresh seafood?"

"Do you sell postcards?"
"Where can I find film?"

Be careful when you say film. They will not understand you if you say it improperly. If you have difficulty pronouncing film, you should say, "Where can I find camera film?"

"Where are the shopping carts?"
"Where can I find a shopping basket?"