After all this research (i.e., I made a lot of pitchers and got very burpy), the best fruit to add to water is actually a combination. You need a base (cucumber), a sweetener (strawberry or watermelon), and a weirdo herb (basil or rosemary).
My secret weapon: cucumber, strawberry, and basil. It’s refreshing, a little sweet, and has a basil finish that makes you feel like a culinary genius. It’s so good, you’ll actually forget to complain about drinking water. And that is the real victory.
So go forth, infuse your way to hydration, and remember: if anyone judges you for putting basil in your water, tell them a certified internet stranger said it was science. Cheers, you beautiful, hydrated weirdo.