Hi KDCwv32 ,
Generally speaking, depleted potassium levels may be caused by severe episodes of vomiting and diarrhea, diuretic medications, impaired renal function, acute renal failure, inadequate diet, etc. To my knowledge I am not aware of water intake affecting potassium levels. A physicians evaluation can determine the causative factor in relationship to the potassium levels. Best wishes.
Theresa Jones, RN