Wear a mask, it raises prevention of not getting sick from another players cough. Easiest ones to find are in medical cabins, dust masks are in more industrial areas. Keep surviving.
Stop hoarding food and eat fat, only takes 6 slots and eating 2 back to back can hold you over for at minimum a full irl day of playing.
Tetracycline, is an important found in bright blue medical cabins and hospitals (looks like a school just no chairs. Pop 2 pills and it fixes all sickness besides Kuru (cannibalism)
Sewing kits can heal wounds and clothing. Only takes up two slots. So drop those bandages and save space.