The "craps" huh, gamblers anonymous may help, or Pepto. Make your own electrolyte mixture there are different "recipes" available. Odd that you cramp up but drink as much as possible prior to the match, & cut the amount down as the time approaches. You ay want to start a vitamin regiment or potassium pills, lots of bananas etc
Powerade and lots of water are examples of drinks that one should take before a soccer game. This is to enhance body hydration, which in turns avoids dehydration which could have other consequences. Note that, you should avoid energy drinks before a game as it tends to increase your heart beat.
Water banana as some one said I understand about the potassium but don't take potassium pills unless Dr permits it to much potassium can be deadly don't eat a large amount of bananas .Its not good for you .A Banana here and there is ok.Drink lots of water and deep breathing exercises expels 70 Percent of waste in our body it's our main way to expel fat to make all our organs function correctly and to creat oxygen that we need for the brain for focus memory do many benifits