You can use a patch clamp or pipe leak repair clamp to fix small leaks temporarily. The clamps have a rubber pad inside, so when you attach the clamp to a pipe, the rubber acts as a seal against the pipe material. It only takes a few minutes to secure a clamp to a pipe, so it's a quick and affordable solution.

Take a thin piece of rubber and wrap it around the leak once. Then, tightly wrap the rubber with electrical tape to hold it in place. Once this is done, fasten a C-clamp around the patch to create pressure with the seal. This should hold off the leakage temporarily.