Can I have some water or tea?
Don't forget to bring water when you climb Mt. Fuji.
Give me a cup of water and some love, please.
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
You take a look at some water. It jumps out and takes the form of a woman. "Hello, my name is miss (みず) Mizu," she says.