This summer I’ve been drinking my iced tea and water with flavor in it. I add a packet of True Lemon crystallized lemon substitute. The stuff is all natural and easy to use. I’ve found that I need two packets for my 32 ounce water bottle (they suggest one packet for each 10 to 16 ounces, so the math works out.) You can also cook with the stuff, but I haven’t tried that yet.
There are also True Lime and True Orange. The packets are small so you can include a bunch of them in with your kitchen or beverage supplies. More information at the True Lemon site. Stay hydrated!