Is the supply shortage fabricated? There's a ledger in the grove's warehouse that catalogues the usage of food and medical supplies, and it says the druids are almost out of everything. Goodberry and healing spells would make this impossible of course, but it's not uncommon for tabletop game adaptations to selectively disregard or forget about the existence of certain spells.
Found that ledger as well. It makes no sense that they druids would falsify their own storage records, considering these records are hidden from outsider view in the shed.
The issue is that the druid merchant's inventory is full of food and potions, which makes no sense if they are running short; they would not sell them in such a case. But I think it's lack of attention to the details when designing the area, rather than the shortage being fabricated.