Why do i keep getting cramps?

It sounds like you're drinking enough water to rule out dehydration but keep it up so it won't crop up and complicate matters. Gatorade and PowerAde are also a good idea. For now, absolutely no caffeine, soda, energy drinks, coffee, tea or alcohol. Things like juice, milk, lemonade and Kool-Aid are fine.

Take Advil or Aleve, whichever works for you. Either one should reduce the cramping when it flares up.

You have a vitamin deficiency. There are quite a few that can cause muscle pain, cramps and sore joints. The top contenders are vitamins D, C, B, potassium, iron and calcium. Start taking a full vitamin once a day, preferably after dinner since it can upset an empty stomach. Depending on which one it is and how severe, this could take a long time to show results so don't stop taking them when you don't see immediate improvement.

Start some sort of aerobic exercise like biking, jogging, swimming, tennis, racquetball, basketball, etc. Yoga will help a lot too by increasing your circulation, flexibility and muscle tone. Begin with small amounts and slowly increase how long you do it each day. Be sure to stretch both before and after exercising so your muscles won't cramp. A lot of people don't realize that cooling down is necessary to prevent cramping and reduce muscle strain. (Ever heard the phrase "ridden hard and put away wet" about horses? It's the same concept. If a horse is run hard but it isn't walked around for awhile afterwards, it will result in knotted muscles that could tear the next time the horse gets a workout.)