Not to belittle the heat wave, the effect of the water break change doesn’t come into effect o until September. So they aren’t really related as of yet, other than shitty and coincidental timing.
There’s multiple sources mentioning this. But here’s one.
Also doesn’t the law deal with water breaks at work? OPs examples were all people doing their own thing. I think we’re all in agreement though that if people are dying from the heat right now that it will get a lot worse once this legislation takes effect.