I hear a few things from your comments that need some serious consideration while planning out your budget. I used to work in Utilities (steam generation, water treatment) for the chemical industry, and I would love to help in planning!
1. Steam generation on a farm – a steam generator requires soft water that is chemically treated to preserve the generator/steam system. Don’t soften and the boiler will scale much more frequently (use MUCH more energy, expensive to clean). Don’t treat and the life of the generator will decrease dramatically (more expensive to replace tubes/unit).
2. You’ll also need pressure relief, overpressure protection, and a way to collect/reuse the condensed steam. If you’re retro-fitting, the design should be checked by someone who knows what they’re doing before putting it together (esp. the first two – safety is key with steam!).
3. Chemical runoff – make sure the septic is over-sized and can handle the chemicals you’re sending to it. If you live out in the boondocks, you know the PITA of a backed up septic. Now multiply by 100, in the winter (worst-case), with nasty chemicals. Bad news.
4. For non-contact water – I think the creek is your best bet. It will be more highly regulated, but sizing shouldn’t be an issue. Get approval EARLY – your backup plan will add considerable cost.
Again, I would love to help! None of these issues should prevent you from living your dream – planning out solutions will just help you live it sooner, easier, and cheaper.