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Fall is coming rabbits might be in their hole. ;-)

Connect with your soap maker and a local wild game butcher or abattoir and
gather some 'yellow' fat from deer, elk, moose, wild pig... render...

This may be true for many soaps. If you find a shave soap you love get a couple refill pucks
and replace them when you use one.

There are some cottage soap makers that make soap and sell it...

Yes.
Soap making use a fat and a caustic to saponify the fat. They work hard to get the chemistry correct
and have all the caustic react and have just the smallest amount of fat/oil left. Each...

The RO water for steam irons and friends is one good choice. You only need half a tumbler or so.
for the lather.

A pea size bit of Proraso on any hard soap, even Williams should lather nice...