I'm having loose stools after every meal I eat it started when I started to drink more than enough water liker 20 glasses a day Iused to drink2-3total?

Need to examine. Drinking more water would not cause diarrhea. The two events are likely coincidental. If you have had unintended weight loss, it is imperative that you consult a physician.
Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex.
Get HPV vaccine, if you are under 27 years of age.