Multi liquid fuel burner

I've no idea in which sub-forum to post this question. Moderator please move if needed.

I'm experimenting with ways of cooking food during an emergency.
Yesterday I've burned lamp oil inside my rocket stove.
It worked. But the efficiency wasn't very good. Yellow flame instead of blue.

That's what my question is about. In case of an emergency not all fuels may be available. So now I'm focusing on burning liquid fuels of many types. Gasoline, diesel, petroleum, kerosene, olive oil, etc, etc.
Burning those fuels isn't that difficult. But efficiency is what I need help with.

I'm looking for multi-fuel burner that gives me a blue flame.
Less fumes, and more heat from the fuel.

If possible it has to be something small because otherwise it won't fit in my rocket stove. I prefer the rocket stove because it's stable, highly isolated walls and a skirted pot.

so on a basic level you need fuller combustion, and the way most liquid fuel stoves accomplish this, at least for kerosene and similar fuels, is either a wicking action or a pre-heating action, which in either case aids in vaporization before combustion.

my instinct is that you need to have the fuel under a little pressure, which can be generated either manually or as a result of heat expansion.  if you look at how kerosene pressure stoves are designed, it might give you some ideas.  they are manually pumped to get up to pressure, and once it starts roaring, the heat expansion helps continue the process to keep it pressurized.

I'm not clear if you want to build your own burner or purchase one.

Backpacking stores sell multi-fuel burners that work quite well. Last time I checked, MSR and Optimus had models that might suit you.

For a highly volatile fuel like gasoline, an improvised burner can be extremely hazardous.