The answer to 'how to maintain emergency plumbing' is to have a plan in place for quickly addressing any plumbing emergencies that may arise. This includes knowing how to shut off the main water supply, having the contact information for a reputable emergency plumber, and keeping basic plumbing tools and supplies on hand.
Regular maintenance of your plumbing system can also help prevent emergencies. This includes inspecting pipes for leaks, clearing drains, and ensuring your water heater is functioning properly. Addressing small issues quickly can often prevent them from turning into larger, more costly problems down the line.