I noticed that many new players have problem with out of raid healing and its accumulated price over time. Well i have solution for you guys.
Instead of buying 3 AI-2 medkits or 2 Car first aids and use them all (with heal all), you could buy 2 Car first aids and use them manually on limbs until there is almost no uses.
Then you buy 2 army bandage and in your hideout you can turn 4 Car first aids(which you used so it basically cost you nothing) and 4 army bandages to make 6 IFAKS. Which in turn you can sell . So if you use Car first aids for healing and keep selling IFAKS you will be able to have no problems in raids.
Hope this helps.
P.S. if this is well known thing sorry for spam
*EDIT* You need lvl 2 Medstation to make IFAKS