Malkin wrote:
As for part 2 of your question, Laura, there aren't any stimuli which give water to a creature - they generally make it themselves in the respiratory process, so your instinct that you'd have to inject a chemical into them is right. ![[ngrin] [ngrin]](/images/smilies/emot_grin.gif)
Ah, I thought so. 
Thanks for the input, peeps. This was very useful, especially the info about the water CA not being used for anything; I didn't realise that. The agents in question have already been finished and released now. I hope everyone enjoys the fruits of this topic. 