Don't know what the labelling laws are elsewhere but in the UK, bottled water generally comes in two varieties - mineral and 'spring'. Mineral water is bottled at source from natural springs, rivers etc and has to have all the mineral content listed. 'Spring' water, even though it may be labelled as 'bottled at source' - the source may be (often is) bottled from the water mains!
You can remove chlorine from your water by boiling it if you don't want to bother with filters.
Where I live, it isn't safe to drink from wells or springs due to run-off from agricultural land, there are a lot of sheep farms so the problem is a nasty bug called cryptospiridium People who rely on wells and springs for their water supply have to have special filtering and UV treatment systems fitted.
Also for you folks who use the water filters on your taps - please make sure you change them REGULARLY - all the nasties they filter out stay in the filter so its efficiency reduces and gradually goes into reverse - need I say more?!