Almond milk for 7 months old

I am still giving formula but there is a shortage in my town and I’ve even looked on Amazon, the company website, sam’s club, Walmart. I live in a small town where stores are 1 hr plus away and I’ve been to every store I imagine. My baby can only have two formulas due to constipation and doesn’t tolerate others well. He takes Enfamil gentlease neuro pro & reguline, and currently that’s the ones out of stock. I’ve tried other Enfamils like the regular ones but they still cause constipation. Doctor told me not to switch formulas because it could make his bowels harden and tummy troubles.