I've noticed that London tap water is now tasting really unpleasant.
Years ago we used to have a Brita filter, but found it a bit fiddly and just sort of stopped. I'd also rather use something that isn't plastic when filtering water, given plastic leaches into water.
A friend has just got the Berkey and swears by it.
www.amazon.co.uk/Travel-Berkey-Purifier-elements-Filtration/dp/B00FMUYU6I/ref=cm_cr_arp_d_product_top?tag=mumsnetforu03-21&ie=UTF8
Others have the very swish under the sink variety - but I imagine you can only get that if you are doing a kitchen refurb??
So love to hear what you've done and why!