Real shame that the water in your flat doesn't taste good - generally, Glsgow water does taste nice, with Loch Katrine the main source reservoir. In fact, being water from peat area, it's relatively acidic, although acidity is regulated by the water supplier. Acid water and old lead pipes used to be a serious health concern, particularly in the central belt.
One of the problems with living in East Anglia (in addition to lack of mountains) is that water generally comes from boreholes, rather than reservoirs - having grown up in West Midlands and spent many happy school holidays touring reservoirs & sewage works with our dad who worked for Severn Trent and predescessors meant I'm still uneasy drinking water that doesn't come from rain falling on Welsh hills.