@Rishy if you want to leave a gift for your sitter to show appreciation that’s a nice idea - nothing is expected and a sitter can’t ask for payment .
We have had food left for us by hosts and we appreciated it .
You may be interested to read this thread where gifts have been discussed
https://forum.trustedhousesitters.com/t/as-an-owner-do-you-give-any-type-of-gift-to-sitters