Hello i have the flu and a tempeture of 38.9 im wondering is it normal for my legs and fingers to cramp every time i move im drinking loads of wwter?

Not normal, but...: ...it is not terribly unusual. When your temperature goes that high, your fluids and electrolytes are bound to get thrown off, in spite of your water consumption. You should make sure you get enough potassium along with the water. You could drink Gatorade or Pedialyte, or eat bananas. Also, your body is dehydrated until your urine is clear. If it's still dark or yellow, you're not drinking enough.