As what Loinen22 said play Normie, Classic or Realism and you could limit yourself to not trade with others players. This way you can buy the things you want from the shops. As an Ironman, you're meant to gather everything you need by yourself and if you give players the opportunity to buy essential items from shops etc it would completely ruin the game mode in my opinion. I play an Ironman myself and yes, early game can be a struggle but once you get to the later stages of the game potions, food, runes and other essential is not an issue.
No support from me, sorry.