| Answer | Crossword Clue |
|---|---|
| AERATE | Treat tap water |
| EVIAN | Certain upgrade from tap water |
| FREE | Like tap water in a restaurant |
| DESALT | Treat sea water |
| OXYGENATE | Treat, as bottled water |
| DESALT | Treat sea water, in a way |
| MALARIA | Illness that tonic water was invented to treat |
| REICE | Treat with a bag full of frozen water again |
