It would be a good idea to have 2 masks in ‘circulation’ at all times. This is so there will always be a “clean” mask available when you need to go out.
As soon as you arrive home, wash your hands and inspect the mask for any damage (both inside and outside) before putting it in storage.
Proper storage of respirator masks involves hanging used respirators in a designated (dry) area or keeping them in a clean, breathable container such as a brown paper bag.
Use the second mask the next time you leave the house and repeat the process from there.