Another thought... A cat/dog rescue place would probably have fluids and they might be willing to give/sell you some. If you lived near me, I'd give you some.
You *might* be able to use saline for eyes, but I don't really know... Search the web. Your other option would be tube feeding Pedialyte, but only if you're sure you could do it without aspirating your roo.
This site has some very good info on how to do it...