Hospitals
Your vehicle isn't the only vessel that needs repair! You will find yourself being injured here and there; Whether you got hit by a car, fell off a roof, or got shot by the local militia.
Getting healed will cost money because Capitalism that's why!
Visit a hospital - Talking with the hospital NPC will give you the option of healing to full and buying consumable items (which will be located in your inventory under 'gear') you can use on the go! Some items offered include Medkits, Bandages and Codeine.