en_tn/1ti/05/23.md

You should no longer drink water

It is implied that Timothy should not drink only water. Paul is telling Timothy to use wine as medicine. The water in that area often caused sickness. (See: rc://en/ta/man/jit/figs-explicit)

for the stomach and your frequent sicknesses

"because of your stomach and your frequent sicknesses" or "to help your stomach and to stop your frequent illnesses"