Ah, that is the potion you mean. There is an order where you can tell guardians to use buff potions.Oh, So In That Way I Can Make Them To Take Potions Too Like Gills Potions,Archer, etc...?
EDIT: Does The Mod Has A Discord Server?
The mod doesn't has an official discord server, or a discord server at all I guess.
The only server It has is a Steam Group. You can find the link on the main post.