RO would be good (removes bromine, chlorine, etc) but RODI would be too aggressive for a child, heck even an adult. I know some people do drink RODI but it's not actually safe as it strips salts from your body. There have actually been cases of people dying from drinking only RODI in the summer time when their bodies are already stressed for minerals. If you want me to go into the reason why RODI does this I can but I'll save you the science mumbojumbo for now. In big RODI systems for drinking water they actually, by law, have to add minerals back into the water for it to be safe. RO doesn't get to as low concentrations so it's not as much as a worry.
I have a business that makes water desalination tech and I love to talk about this stuff, so feel free to ask questions.
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