I run a small cleaning business - a very small business - its just me most of the time, though for some work I sub contract. I have just bought a trolley wfp and will be using DI on rain water. Its for use on a single site contract.
I consider it a business because I want it to grow to provide not only for now but also for my family and future. After finising a job, I wait anywhere between 10 seconds and several months for payment.
Probably the difference between running a business and doing it to make a living, is the play off between ambition and contentment.
Good luck to you whichever way you work.
Cheers
Mike