You're gonna need some real cold water. Either ice water or refrigerated, or really any drink that's super cold and chilled. Drink that first, slosh all that cold liquid in your mouth, and then take a piece of whatever you're eating and put it in your mouth while it's still cold inside. Preferably a small piece, just to be safe; this is still kinda risky to do.
Let me know how this works out for you if you give it a try.
i think ill stick with my method where i just cram the hot food in as fast as i can, burn the christ out of my mouth and make noises while i try to suck air in without aspirating anything, exhale mouth wide while saying, "fuck fuck fuck hot hot hot" and then get mad at god for doing this to me.
For sure, nothing beats tonguing those blisters on the roof of my mouth afterward
For soups I dip a bunch of bread in and eat the bread first then the soup is usually close to an edible temperature by the time I finish the bread.