We are going to try this and thought I'd share it with others. On another forum a PWP mentioned he/she has found Canada Dry's tonic water helpful for night time leg cramping. Apparently is has quinine in it, which if you look that up, in addition to helping with malaria long ago and some other things, (anti-inflammatory, which I found interesting), does help with cramping.

Quinine is in very low doses in Canadry Dry, at higher doses, there are problems. I found it interesting that Wiki mentioned quinine used to be used "off label" for muscle cramps until Big Pharma, er, I mean, the FDA, got involved. Canada Dry's tonic water is, according to this PWP, used also by cancer patients for the cramping they get from all the chemo (he/she knows this because they got dx'd with PD and cancer at the same time).

This person mentioned he/she drinks it before bedtime as it seems to help mostly with night time cramps.

It's cheap, so we'll give it a go and see.