How do i create water?

Hey, i need to make Water in my game but it seems like im stock can does anyone have enough time to tell me the behaviors i need for water.

i would like for my charecter to be able to swim up otherwise fall to the bottom.

This is a complicated one.

Press down to sink, press up to float up faster. But you can change it to your liking.

Thank you very much Latif3 that was REALLY helpfull!
as jngthree said this was a complicated one thanks agian glad to see there is a community here :slight_smile: