A little background first. I am one of those preppers you keep hearing about, and a few days ago I wondered to myself how I would shave in teotwawki once all my cartridges were used up. Finally I came up with the idea of getting a straight razor and learning its use. As such I have spent the last few hours reading all the beginner tutorials on this site. This was in hopes of not asking stupid noob questions, but I am sure I am going to fail at this proposition.

So here goes: I read the preparing the shave tutorial, and more on different oils, creams and soaps. However, currently I am one of those few who just shave in the shower with nothing more than water, and no mirror (I will not be trying this with the straight razor). I do wash my face before hand and then rinse the soap off before shaving, but otherwise its only water which I shave with. Knowing all this, is it strictly forbidden to shave using a straight razor and no creams, oils, or soaps of any kind and only using water?

Now as noob of a question I am sure this is, here is my reasoning for asking: As a prepper you have to stock pile things in the hopes you have enough to last any length of time you are prepping for. As such, and since the whole point of this is to not have to stockpile a ton of razor cartridges, it wouldn't make a whole lot more sense to stockpile a bunch of soaps or creams for said occasion.

Also, as a side note, I do have a book which shows me how to make my own soaps from the lye extracted from fire ashes. Will using a simple bar of hand soap do for shaving with a straight razor?

Thank you in advance for any advice you folks are able to provide for this noob trying to do his research.