Almond Milk Substitutions: You should be able to substitute any non-dairy milk for this.
Vegan Butter: if you don't have an issue with dairy, feel free to use regular butter.
Storage: Store on the countertop, covered, for 1-2 days. If it isn't consumed by then move it to the refrigerator. There aren't any preservatives in this (yay!) so it will only last so long out.