Brida . . . you can get the tonic water at any grocery store.
If you are early in pregnancy, it should be okay but complications can occur later on. Check with your doctor if the tonic water does not work or if you think you may be pregnant.
Bethsheba . . . how would we be able to find out if we are imbalanced or not absorbing? A lot of women in my husband's family and myself have had this happen to us with the night time only leg cramps. One doctor told one of my in-laws that it was a circulation thing related to position at night.
If we could cure this another way (husband gets these, too, but refuses to do either tonic water or quinine), that would be great.
Lindaru