Scuba tank and tail?!

[spottedcatfish]

Here are two good possibilities:

Spare Air



This is used as a small emergency bottle to get an out of air scuba diver to the surface. In a pool, it would last long enough to fulfill some Merfantasies. NB: You must be scuba certified to even purchase one of these, let alone get it filled (which could be done from a scuba tank).

Well I'm not certified (yet!) but I was curious too as to where you would get one of these little bottles from. Here are two sites that sell them:

http://www.h2odyssey.com/dive/pages/...es/airsyst.htm

http://www.spareair.com/product/models.html