Basic things, first and foremost, which is supplying the body with all it requires to properly function, and avoiding toxins that disrupt the bodily functioning, like industrial fumes or mold spores.
Proper conditions for maintaining hygiene. High quality food, nutritiously rich and poor on the toxins, preferably.
A dwelling place that isn't ridden with mold, far from the road and industrial zones.
Companions to do things together, like playing co-op games, learn new things, introspect, or meditate.
A reliable handgun and maybe a cyanide pill, in case of emergency.
This should be enough for now, though there might be more.