Tap Water vs. Purified Water vs. Spring Water
In this experiment, I boiled three types of water. From left to right they are:
1. tap water (Playa Del Carmen, Mexico)
2. purified water
3. bottled spring water
I let each type of water boil until it nearly evaporated. Then I poured the remaining solution in a glass to compare samples. The tap water clearly had the most (unknown) sediment in it. The purified water has essentially no sediment and the spring water had a white cloudy looking sediment.
According to some comparison photos which I found on Google, I surmise that the cloudy sediment in the spring water is the mineral content.