It appears most beneficial to stay hydrated throughout the day and if you must drink while you eat, avoid drinking too much, as well as alcohol and acidic drinks. Drink warm water and drink it sparingly. A small glass will likely not interfere with digestion and by adding a dash of apple cider vinegar or lemon, you can aid in the digestive process further. If you can, you might want to try drinking 30 minutes before and 30 minutes after a meal with no drinking during, see how you feel. If it works for you, then stick with what works, if not, adjust accordingly.