Subject: How to make H3O+(metallic ice) and metallic sodium.

The reactions I'm interested in are:
 H20 (as saltwater) and Na(probably in metallic form)
 H30+("metallic ice" hydroxonium) in a reaction by itself or with H2O(as 
saltwater) or air.
If you are not familiar with H3O+ 
http://www.spaceviews.com/1998/09/article3.html

The H20/sodium reaction is intended for what amounts to a underwater 
rocket.  Saltwater/freshwater enters through the front of the engine and 
reacts with the Na to provide thrust out the nozzle.  I intend to build a 
few and test them to see if the thrust is adequate.
Can metallic sodium be produced easily say from a NaCl(table 
salt)solution or would I have to buy it from a reagent supplier?

Also any ideas on how H3O+ would be produced would be helpful.

Re: How to make H3O+(metallic ice) and metallic sodium.