And sorry to bounce around here, my cellphone posting is a pain.
No investors (me). Suppose someone was to make 20 of these, go to a trade show, and sit there , AVAILABLE TO SELL...$ 46 each.
Try a show with MAKERs or a even a trade show that's kinda unrelated, to electronics....
Like even some backroader dirt bikes or something. Selling 20, at your little table.
I bet those would sell out, at least by end of (tradeshow) day !
Let's see, $46 X 20...that's, uh, some 900 dollars, assuming you can 'bypass' the usual consumer safety protections, in a 'prototype' sales mode. (And of course that's going to cost quite a bit to make 20 devices).
Now see that logistical part is where I'd fall short, having only attended a few trade shows.
But...I WANT ONE IF THOSE !
Pop into a bathroom, and fill the clean water tank, you can at least do a few seconds on 'armpits'....(lol).
The device is heavily dependant on battery capacity, but these days very buildable.
My crude schetch includes those battery units that hold numerous lithium 'button cells'.
You want a heater, of course, but also perhaps TWO pumps, one to distribute water pressure to your personal shower head, but also a WASTE pump, to suck the semi-soiled.water.back up, avoiding any heavy soiling of clothing.
My crude drawing shows the little thing as similar to a pair of headphones, a bit bulky but with approx 1/2 pint of water.
I cannot imagine this thing, (again, at $46) NOT generating interest, with folks walking by your booth...
They, (perhaps) will want to buy one, right there.