I use a reverse osmosis water filter system. It's connected directly to the mains and has its own tap, so it's really no hassle. It's much better than a Britta filter and it filters everything out and you only have to change the filters about once a year.
We use it for cooking and it makes food like pasta nicer, and we use it for the kettle, which doesn't have a spot of limescale on it, whereas without it, we'd probably need a new kettle every 6 months.
Tap water (in the SE at least) tastes horrible and it's not just the limescale - there are all sorts of other nasty things in it, albeit in small quantities.