Because of the heat here that's why I've done a combo of things many might know or do this already but I'll list them here just in case I really feel using all of these measures will prevent heat deaths
1. Shade with bushes, canvas, and a open wood shelter
2. Big ice bottles which slowly melt so they can drink or sit near
3. Air conditioning during high heat hours
4. Ice chips before bedtime
5. ice in water
6. Cool water puddles where they can stand in, the mud cotes their feet too
7. Cool treats like watermelon or cold grapes
8. Misting system to cool ground and shaded area this also cools down the sand for their baths and they take dust baths there putting damp dirt on themselves which cools
9. Putting electrolytes in water
With #9 in your list: That's good as long as the electrolytes are not added to a metal drinking bowl or container. Use a plastic one.