Ok for cooking and perhaps coffee, but RO is 'dead' water devoid of what the human body needs. Drink this stuff every day and guaranteed you will be dehydrated and misty-headed.
Op, do those machines at your peril. Have they changed the filter etc? Also, keep reusing bottles over and over again, you end up getting bacteria(lised). Better off buying bottles from 7, or drinking beer or gin... as they did in the day, even the kids!