mmm. . .I would not go with all water.
A tiny bit of ethylene glycol goes a long way to increasing the boiling point of water. Without any glycol you'd start boiling water when your AC comes on.
You might be able to go 95% 4% and 1% whatever is in water wetter(I think its a straight alcohol but you'd have to go look at a bottle). That would get you some better cooling and maybe drop you from 213-216 with AC to 208-212 and normal of like 200 when its toasty.
I really wouldn't go 100% water unless you are willing to refill it every day. . .(use tap water, non-filtered for sure again. . .)
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