The cheapest way to redo a shower is to remove the old shower head and arm, and replace it with a new one. This can be done by using a wrench to loosen the old shower head, and then twisting on the new one by hand. If you have hard water buildup, you can use vinegar or CLR to clean it off before installing the new shower head.

There are a few ways to redo a shower on a budget. One option is to purchase an affordable shower curtain and liner, and then install a new shower head and faucet. Another option is to install a pre-made shower kit, which can be found at most home improvement stores. Finally, if you're looking for a more luxurious upgrade, consider installing ceramic tile or marble floors and walls in your shower. Whichever route you choose, be sure to consult with a professional before starting any renovation projects. Good luck!