Cool water def helps heat but good question re: humidity. Articles said humidity limits body's ability to evaporate sweat, which is our natural cooling mechanism. Cool water and icy drinks and so forth help with heat, but if you can't evaporate sweat off you, not sure what would help. Just toweling it off it guess.
Maybe wear a bunch of moisture absorbing plants???? Grow oneself a plant robe???😆
Solarpunk sillies.