Back in 1988 or so I was in Moscow at «Дом книги» with a former student. He was thirsty. I asked a saleswoman whether there was any place he could get a drink of water. I figured the woman would say to one of her coworkers something like «Покажи нашему гостю, где попить» “Show our guest where to get a drink.” Instead she said, «Надь, напои этого мальчика» “Nadya, water this boy.”

Wow, talk about a learning moment. Once again a Russian had shown me her ability to compress what was a multiword phrase in English into a single Russian verb: поить/напоить. The verb means “to give [something] [to someone] to drink,” and it's conjugated like this:

The person or animal that will be drinking shows up in the accusative case. The thing you give them to drink shows up in the instrumental case:

Note: standard dictionaries describe the stress pattern of this verb as either shifting-stress or end-stressed. All the native speakers I have consulted prefer the shifting stress pattern shown here.