Your body will get more used to drinking lots of water, the more you drink. I'm up to 94oz a day and it doesn't even phase me. It was difficult at first, but your body adjusts. An entire cup of amniotic fluid is replaced every hour, and drinking water is one of the MOST beneficial things you can do during pregnancy.

Try this: Set the alarm on your phone for every hour, and when it goes off drink a glass of water! That way you can spread it out over the day and it shouldn't make your tummy hurt!