Drink a lot of water.

I just bought one of the neck fans an it has helped me with the heat. It’s 107 right now and I won’t go outside until morning.

I drink lots and lots and lots of water. I also check blood sugar more frequently - after exercise and after prolonged exposure to the outdoors.

Staying hydrated, and try to stay as cool as possible as heat causes stress,and stress can raise numbers

It also Depends entirely as to what you are doing in the HEAT 🔥... If walking use an umbrella ☔ and ALWAYS take a 1ltr bottle of water 💦 with you. Every 10 mins drink. Any place will fill it up for free if you ask nicely.
If you are exercising in the heat 🔥 that's when other drinking methods are required. You will sweat profusely and as we sweat 😰 we lose our bodies electrolytes (Salts).. If these are not replaced then extra stress on all of your bodily organs begin to suffer. Eventually you will cramp. To prevent this always use REHYDRATION TABLETS IN YOUR DRINKS.. You can get them easily off Amazon etc. ALWAYS do a WARM DOWN 10 mins before finishing.. A large cold towel over your back and once you've stopped sweating a cold shower. Hope this helps