What's the difference between mineral and spring bottled water?

Tweet

Are mineral water and spring water the same, or is there a difference? If so, what is the difference? I like to drink bottled water becuase it's convienient to take to work with me and also becuase at home our tap water isn't very nice, and of course isn't that cold in the summer, wheras you can chill the bottle in your fridge. However, i just wondered about this small point, and if any of you MyLotters could help me with it?