Goodberry: A Solution?

Okay, how does this variant of Mark's idea sound: continually burn EITHER two 1st circle spells OR one 2nd circle spell, and everyone's got their own 8 pts of Goodberry healing until the next time you can go and make more berries at the Greenhouse.

This burned spell slot(s) essentially accounts for a Preservative spell.

Plus, yeah, you use a few other spells in the downtime to make the berries in the first place (it takes two 3rd circles to make them- one for Betterberry, one for Plant Growth just to get the damn berries in the first place from The Greenhouse's stock).

Any night you wish, you can rememorize over those burned spells to get whatever you want, but then all berries expire in the next 24 hrs.

That makes bookkeeping minimal.