Tools for skin treatment (Red Dead Redemption 2)

Please tell me!

1. How to buy camp instruments for skin treatment?
According to the book they are 180 bucks.
Donated. On account of the gang anymore.
And this book sale is still not active.

2. These tools for skin treatment when necessary at all?
If I make the bag a hunter they need?
If I make the bag of the guy in the camp, are they?