Marge, you can buy Tonic water in any supermarket or most anyplace. Any brand will do. It contains quinine. Buy the Tonic water in the same area as the soda is kept. I started with a glass a day and cut it to l/2 glass since the taste is ugh. Someone posted and said you can buy quinine tablets. I'm going to look into that. BUT, the tonic water is a quick fix for me anyway and pretty cheap at about $l.00 a bottle. Good luck. Still works for me and I did have cramps bad all over my body and several times a day.