Yep, I have to go sorta with this.
For me, YMMV, cramps are low potassium or pinch spots. These can be a wrinkle in pants, a parachute, etc. be VERY comfortable when getting in before launch.
Potassium can be had in sports drinks or bananas which are sorta "low waste" when eaten as well as easy to deal with.

As to sports drinks, I and others usually dilute about 50%. If mixing from a powder, easy to do. If from a store supplied bottle, save a few empty bottles and mix 50/50 with water.
Yes, I stick to "fruit punch" or similar, makes it easier to NOT drink a pee bottle late in the day......;-)