Water is a Privilege, a Chance, a Convenience...
But also a natural resource that has become rarer and rarer...
Let's preserve it! Don't let's waste it!
We thank you for using it sparingly.
Pastabos apie vertimą
"avec précaution": I translated this expression with the adverb "sparingly" = "avec modération", because I think that's what you really mean. "with caution" wouldn't express your meaning so well.