Reverse burping practice daily, drink 2l water before application maybe 1l spread out over the 4 hours leading up to the application then chug another 1l just before applying.
Abstain from everything lots of foods temporarily put the vomiting function in the body to sleep especially lime, lemon, apples, anything with pinene alpha or beta.
I have done aya thousands of times and I have only purged 5-10 of those times and many of those were very high dose I have just found personally most of the time I get much more for aya by letting it make its way out the back door instead of cutting the potential short by purging.
I have done kambo probably between 10-20 times and only in 2 of them I did not purge and that was because I used a non traditional application spot.
If you don't purge with kambo then you may be squandering the divine gift that is what makes kambo so unique and special. The magic or a important part of it is the things kambo can remove from the body that cannot be removed in other ways.
After practicing reverse burping after applying a few dots I became able to control my vomiting reflex around 99% or greater, as in I may get pangs of nausea and even experience my guts clench to try to force bowel contents out the mouth but I never actually vomit anymore unless I allow myself to ever since the first time I tried reverse burping before and during kambo.