If it's just drinking water you want, get a Berkey water filter. They do different sizes depending on how much water you go through.
https://berkey-waterfilters.co.uk (this is just one of many sites and suppliers so shop around for the best deals)
They are pretty decent and remove a lot of the nasties which other filters for sale around here do not. The filters are not cheap but they do last a while. You can also buy add-ons such as filters that will remove any fluoride that's in the water.
DO NOT drink the tap water here (or even in UK) if you value your health. Although if you did, you're not going to keel over straight away but the water here is full of chlorine and who knows what else. Chlorine will damage your thyroid amongst other things.
Speaking from experience, and providing you can afford the electric bill, a good water distiller is the best option for pure clean water. Only after it is cleaned, it is best to re-mineralise by adding a few grains of brown rice or some lemon or something to the water. When you see what's left in the tank after a distiller has run a cycle, you will see what i mean about not drinking tap water. It will put you off for life.
Hope this helps.