I dont have refrigrator what are ways to keep milk without that?
You really just have to find a way to keep it cold. The only way to keep perishable food from spoiling is to keep it below 40F/4C. If you can't do that, you'll have to use it fresh. UHT milk may help with that, because it's shelf-stable before opening, so you may be able to get a larger number of smaller size ones that you can actually finish quickly after opening.

There are some things you can make out of milk that have longer life at room temperature, but they're not really milk anymore.

Boiling really can't fix this, because it doesn't kill everything, because the nasty stuff produced by bacteria can survive even if the bacteria dies, and because whatever's left (or whatever drifts in and recontaminates it) is just going to have a nice friendly environment to grow in after it cools back into the danger zone.