Endothermic reaction

[walsh]

Are there any compounds readily available which can create an endothermic reaction when combined with water, without being deconstruct-able to an explosive.

I have had an idea, but my initial plan won't work, as if probably be arrested trying to buy ammonia nitrate.... Unless it's possible to make it inert, whilst retailing the endothermic quality.

Would help if the solution was non-toxic also...

I'm stuck. Thanks in advance.

[walsh]

Thanks for the help guys.

A little background for application.

I had an idea whilst a little sozzled ( as you do, proper back of a napkin stuff), for a chemical, portable drinks cooler. My idea was around a disposable powder capsule/ Gel Maybe, which could be combined with another to create an endothermic solution. Made a million times easier for application if the other compound happens to be water.

I have no interest in becoming the chief munitions officer of my local nick however.

Salt wont do what i need it to as far as i am aware, urea may do the trick, but...well, no one wants to piss on their beer cans now do they.

Any other suggestions. Or.. any derivative compounds ( Some sort of stabilizing agent to remove the denotation aspect, if that's even possible? of ammonia nitrate which could be used for this purpose?

Thanks again, as you can probably guess, I am not exactly a scientist!