Fairly New to the game (level 21), is it written in the code that the item you need won't drop?

I've needed 1 of the middle expansion things to open the fishing area. I have 19 each of the map and other thing drop but none of the one I need.

I need tons of almond milk, all day I've gotten almonds and only 3 milks (I collected almost every 90 minutes).
I need the soy milk, I've only gotten soy beans (for 2 days).

Is this typical? My storage filled up because I've premade all the parts I need to combine for my delivery items, but each delivery now needs soy milk and/or almond milk to finish.