So, I see four ways to go about doing this, but none are particularly easy. The first one is to send the ship into a low Mun orbit (as low as you can). Then build a third ship, with at least 6 Km/s of D-v, and send that ship to rendezvous with the first one. The rescue ship rescue should have either 2 seats or a probe and one seat. Then send it back home. Second, build a ship which can do the same thing as the first one, but better, and run the mission from Kerbin, Mun, Mun landing, Mun orbit, burn retrograde to Mun's orbit, and back. Third, wait until you are facing towards Kerbin, and burn straight up. As soon as you reach intercept velocity, stop, and play with your orbit until you get back home. This saves you the horizontal velocity needed to go to orbit, but risks leaving you stranded in a high kerbin orbit, needing a rescue ship with a lot of D-v to get you. Fourth, do the same as the one above, but use your jetpack to push yourself to home. Yes, this is a viable strategy. Detach everything except your landing capsule, and be sure to grab all the science! Engage SAS (hopefully you have unlocked EVA and have a probe core!), and point in the direction you need to push. Then get out and push! When you have 1 unit of fuel left, get back in, get out, and restart the process all over again. Repeat until you have areobreaking.