You should store 1 gallon of water per day per family member. So, if you want 2 weeks or 14 days of water storage, and you have a family of 4, you will need to make sure you have 56 gallons of water stored. Dogs and cats need 2-6 cups per pet per day; Chickens - 2 cups per bird per day; goats - 1.5 to 2 gallons per day and I would recommend the higher amount if you are milking the goat at the time they need to use water storage.
There are also many types of water filtration systems available for use. You should really invest in some type of filtration device but that's another post for another day! Just make it a priority to store water now. In my state, over 70% of the state is in a extreme drought situation. Know what's going on where you live. Live Prepared!