The Snacks mod is a fun alternative to the more realistic life support mods. The only way to add more resources for a longer journey is to add more hab modules. This ends up simulating the need for more living space on extended missions.
The jetpack is an awesome addition to KSP. Is it possible to use the parachute by itself? I have the kerbal wear it like a backpack, but I don't think I can deploy it unless it is attached to something else.