Currently we just have a tap but I am looking into getting a Water butt. One for the front, so I can easily access water and a couple for the back garden as it is bigger and when I sow all my lovely seeds it will also be a lot thirstier.
In England it rains all the time so it worth storing the money that rains down for free, plus most plants prefer rain water to what comes out of the tap.
Currently my water sources all come from the tap whether they end up in a cup of tea, my atomiser or the hose. We have a few sunny days then there is chances of rain so my garden will get a nice soaking.