Here's a little water chant (orayer) that some tribes in the Pacific Northwest use to use on those rare occasions we went a month or two without water.
It's in Chinook Jargon so I will have to translate also.
Mika makook chuck, Hyas chuck, skookum chuck. Kee chuck, na laaally chuck. Saghalie (pronounced sock-a-lee) tyee mamook chuck potlatch, klooshe chuck, kee. and Repeat.
It means: We need water, lots of water, strong water. Now water, not water later. God make water as a gift, good water, now.
It was often done while doing the Thunderbird Dance. The Thunderbird brought the rains. You can make up your own dance.