You can make a medic (unit with medical backpack) and stock up on Nectar & Salt Pork from the shop.
Wait.. so the medic pack heals other units in a stack? I've always skipped this tech as I've had other priorities and thought the kit only healed the unit it was assigned to. If it heals other units, I will quite enjoy designing some battle medics.
Once we are able to cast healing on the strat map, we can finally have traditional healers and magic using clerics. I look forward to this.
In the meantime, I'm liking Stmorpheus's thoughts on having the fortify feature grant a slow heal.