https://dnd.wizards.com/articles/sage-advice/rules-answers-august-2015

Now. Scroll to spellcasting. 40 HP! With one Goodberry spell as a Life Cleric!

Unsure if Hekazu would approve this, though. I can see another exploitable variant easily, besides Druid 1/Cleric 1 or Magic Initiate as a feat chosen at Level 4, for Kyra. Obviously, no pressure, Norschtalen. 

If allowed by the GM, you could pursue a Ranger 2/Cleric 1, for more of an archer feel, it may release you from a committed healer while simultaneously granting you 40 HP with one Level 1 spell.

Wish I had seen this sooner.