Dave,
Yes the water is getting worse in Sheffield especially in the summer when they have to mix more hard water in to the supply.
ROs are easy to install. You can fit it in your can or at home. If you fit it in your van you will have leave your van hooked up to the water supply over night. OR if you fit it at home you will need a tank to store the water and a transfer pump to get it into you van, but your van is free to use any time. I prefer the tank at home method.
Installation in a van or at home is quite straightforward. You need a water supply and a drain or somewhere to direct your wastewater. If you gave an outside tap the its a simple a connecting a hose pipe, otherwise you may need to a bit of plumbing.
We are in Hull, just down the road from you. If you care to give us a call 01482348200 or send an e-mail with your details we can point you in the right direction and supply any bits of kit of need.
steve@freshwatersystems.co.uk