Dont have first aid cream, got a cut or ingrown toenail or something, what should I do?

Do you have rubbing alcohol? that works as well Washing with soap and hot water will also clean it fine. You should cut any dead skin away from the area put up with the pain to see if you can find anymore nail stuck in the skin, but don't cut the nail any further back, and let it bleed a little the blood will help to kill any bacteria. Wash it with hot water and normal soap then keep it dry. After all that just leave it alone so you don't irritate it more.