I am an omnivore but even better than milk I HIGHLY recommend a starch to correct a mouth burn from capacasain. The ideal being Wonderbread type of bread.
If at a restaurant you should be able to be able to order 1 of these depending if its Asian (rice, add coconut), Latin American (flour tortillas, sweet potatoes, add avacado) African (injera), Euro or euro-american (pasta, bread, potato) or middle eastern, (couscous, lemon).
At home most people in English language countries have either bread or cooked rice.
Soft white sliced commercial bread (i.e. Wonderbread etc.) is ideal but even pita bread can work. Tear off crust, pop in mouth, can use additional slices to rub on lips etc if it's a child or very sensitive adult. Make sure child washes hands with lathery soap!
When I was 6 I opened a butter tub but it was being used as Tupperware and filled with jalapeno liquid w the peppers. I didn't eat it, but it got on my hands and I only washed it off with water. of course my hands got in my mouth eventually.
I thought I was dying as I had only been exposed to Irish-American cooking, (mostly boiled veggies, meats, only spices like salt, peppercorn or paprika).
The wonder bread helped immensely.