Where does all that water come from? It comes from the fluids you drink. This goes to show that drinking water while pregnant is extremely important. Your health, and the health of your baby, depending on it. To help you stay hydrated during the day, here are five tips for Drinking Hot Water During Pregnancy. Water keeps the blood properly hydrated, making it easier for the heart to pump. It oxygenates the organs and muscles which reduces the risk of cramps, strains, and circulation problems while pregnant. Your body is slightly dehydrated when it wakes up after six to eight hours of sleep.