On Sat, 29 Sep 2007 13:57:27 -0500, Brian Whatcott
wrote:

(That would however take a hand pump capable of supplying a flow
at 15 psi plus. Like a bicycle pump, or better? )

Grease guns are, some of them, capable of at least. hundreds of psi.
I happen to own a 0-5000 psi gauge. Bought it to check tractor
hydralic systems. I forget just what a grease gun pumped it up to, but
it was a lot.
There is a reverse osmosis watermaker intended for liferaft use, with
a hand pump, and RO takes hundreds of psi. That is what you want, if
you actually need high pressure.

Casady