Yeah, I did that - but I needed 5$ and only got 4.5$ out of it. And afterwards people didnt want to buy my water anymore and only gave me 0$ low - so it was kinda soft-locking itself. Some starting amount of money and the instructions saying something like "Hey! It's time to build your own water purification system! Buy some equipment from gramps over her!" and then everything would have turned out for the better.
Still interesting and good concept! :D