Very interesting source for do it yourself molds upto 12inches of any height

[Fatman]

These folks sell a clear PVC that is FDA food grade.
Sold by the foot, not cheap but it could make for some interesting projects.

Be forwarned they have a minimum order of 10ft.
Perhaps several folks can combine or a microcreamery can use it.
http://www.usplastic.com/catalog/item.aspx?itemid=24353&catid=0&clickid=popcorn

Here's another place that does sell by the foot, a bit more pricey but you can buy just 12".
http://flexpvc.com/cart/agora.cgi?product=PVC-CLEAR-PIPE-UV-Thinwall

Things to watch for (Taken from the NSF website)
http://www.nsf.org/business/standards_and_publications/continuous_maintenance.asp

NSF/ANSI 2 = Food equipment

NSF/ANSI 51 = Food equipment materials

NSF/ANSI 61 = Drinking water system components-Health effects

NSF/ANSI 62 = Drinking water distillation systems