People making things complicated only. Don't know where it came from "white caps" tik tok kot. Not to make you confuse, its RO Water.
Genereally RO water is just less healthy from Mineral water. I always finish RO Water within a day. Not overnight. Somehow especially Summer RO Water, if you keep overnight, the water have a kind of aftersmell. Mineral water don't have this problem tho

Just read the label. THey always will say treated water SYABAS etc. Don't bother with the white cap. It means nothing in malaysia