I don't know about the food, I'd check with the company.
The pond water... there was a post or a story posted here a while back about the dangers of pond water.... let me search a little and see if I can find it.

Here's some stuff I found:
This first thread is the one I was thinking about
http://petoftheday.com/talk/showthre...ght=pond+water

http://www.gather.com/viewArticle.js...81474977277273

http://petoftheday.com/talk/showthre...ght=pond+water