Hi, the quality of the junk you are using can play a factor, if you manage to get to Military Base, launcher Cyclops drop tronix parts, you should get a good yield from those and I'm pretty sure they make survival kits. But depending on your chosen class, all classes bar gentank and aggressive monk can use though most basic psi heal, its well worth getting on top of that as early as you can. If using tank buy a nanite heal tool from crytons, medi's will help boost healing done when using either solution.