We decided to drill for water, others on our sub division had done that as the water flow to houses was pretty weak. Easily done, and we never connected our house to mains water, so our water costs are minimal, and we always have a pressure tank full of water. It is certainly purer than the mains water and we will get it tested for purity when we return there later this year.
I think anything which will stop you being reliant on the generally abysmal mains water available is worth considering.