Give me water.
Some water, please.
Water, please.
Water, please.
Give me some water, please.
Some water, please.
水をくれ!
Water, please.
お水をいただけますか。
I will thank you for a glass of water.
I want some water.
Please don't waste water.
Please don't use more water than you need.
飲み水.
飲料水.