I'd use the water from whoever is supplying the fish. That eliminates the temp. and chlorine problem. You will have to acclimate the fish to the pond water before placing in the pond. It would be too hard to acclimize the fish at the pick-up point to the pond water.

If you cool the water for transport, then you will spend longer time adjusting the temp at your pond.

You can get non-iodized salt from just about any grocery store.

Material that the box is made from? Anything that will withstand the rigors of lots of water sloshing around. The rubbermaid containers are rotomolded reinforced plastic I think.

Fish hauling tanks are commercially made from aluminum or stainless.


www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).