Yes, I've done it several times over three summers. Of course it's not a good idea to leave it empty for very long (since the pressure of the water in the pool helps the pool stay in the ground) but sometimes it is necessary to completely empty it, say for removing a large spill of decomposing leaves, cleaning the bottom, or repainting the pool.
Drain pool and clean with muriatic acid
No, because gunite will not dry if it is constantly being mixed with water. Drain your pool first.
I assume this might be to keep any dirty ground water from running into the pool.
You could drain your pool and have it cleaned. Or just have a pool cleaner clean it for you. And next time use chlorine to prevent larvae from hatching in your pool.
You should maybe drain the pool. Then scrub it and clean it properly, maybe add disinfectant too. Or be lazy like me and just get a new one
NO however you should keep in mind that the ground water outside of the pool is not going to put pressure on it as this is capable of even lifting a concrete pool out of the ground.
It could be that there is a crack in your pool's foundation... Depending on the amount of water that is gone, there is also the possibility of evaporation, which is more likely to happen during warm weather.
Drain the water and clean the pool it self with regular soap and wash it real good.
You can. but you should not leave an in ground pool empty for any period of time. Ground water building up around it is capable of even lifting an empty concrete pool out of the ground.
Drain the pool water, give the tiles some good pressure washing. It is best to use a surface cleaner from bestcargurus making sure that no moss and algae are stuck on the tiles. Then fill it up again with clean water
Pool steps can be made of concrete or fiberglass, depending on the construction and size of your pool. Contact a local pool service about the steps. If your pool is properly maintained, there should be no reason to clean the steps. There should be no algae or anything else accumulating on any surface, so do get some professional advice..