You sit down at your table at the restaurant and what’s the first thing you’re offered? A giant glass of ice cold water.
It’s not too much of an exaggeration to see this as poison for your digestive process, especially if you’re a reasonably sedentary person living in a temperate climate with the mod-cons of climate control.
Ideally, aim to drink your fluids away from meals. If you’re eating something particularly dry, a small cup of something room temperature or warmer should do nicely.