Re: Milk consumption?
I've been able to get 50lb (~22.5 kilo) and 100lb (~45 kilo) bags of flour all along. As have bakeries. There is no flour shortage. The shortage is in people, who are not allowed to fill "non-essential" jobs such as filling consumer-sized bags of flour. And bog-roll.
Yeast is free, it's in the air all around everybody reading this. There are plenty of online articles explaining how to catch live yeast for yourself, and how to use it, so I won't re-invent the wheel.
I go out with a jug to get milk twice per day, when I milk my cows. It's a quality control thing. I like cows, they are inherently honest critters.