I think that should be fine. Apparently it should be 3 litres a day, but water in food counts towards that as well, plus teas, coffee.. any drink you have. But water is definately better. Should be drinking 1.5-2 litres
As Jess said you get water in food, so as long as you drink about 1.5/2l over and above that its plenty and that includes soft drinks, tea, coffee and water so its not too hard to do