Do you have an Isi whipper in your kitchen? It's good for more than whipped cream and fancy foams- CO2 charges will work nicely with it, opening up a whole world of carbonated possibilities.
As always, use your best judgement. The whipping canister uses very high pressures, so never open it until the pressure has been released. If you have any questions about the process, let us know in the comments. Happy carbonating.