How many glasses of water have you had today? Did you know if you’re pregnant (or breastfeeding) you need even more water than the average woman? You should be trying to drink around 2-3 litres of fluid a day. Water is best but milk, juice, tea, coffee etc. all count towards your fluid intake. It’s easy to fall into the trap of drinking less than we need to avoid frequent visits to the toilet and some people believe that drinking too much is the cause of their fluid retention.