Hey 360 here. My experience with followers:
They will use Buffout
Charon is the only one to use a stim very very occasionally
Charon, Jericho and Star Paladin Cross will use food items if they have no Buffout (Cross won't use the Buffout at all)
So maybe give those guys some food and leave the area and see if they eat it. purified water perhaps... I figured out about the food as you find food items on certain NPCs, as in all the hit squads, and traders. Namely NPCs that seem to get into battles; I tend to find food items on them.