Feit do not specify precisely the supply type needed: ac or dc.
Generally an LED will need a dc voltage, that sort of light bulb normally needs constant voltage, as opposed to constant current.
I attach the specification sheet for the type of bulb you may have.
This clarifies that each bulb is 6.6W and 12V.
Because you are running two of them at once you would need 13.2W as a minimum but this would mean you were running the power supply at maximum load, so perhaps a 15W or higher wattage supply would be better. Some examples of a simple plug in arrangement might be
this one (24W) or
this one (18W) the output is a 12V barrel plug which would mean you would either need to get a suitable socket to match and wire that onto the lamp or cut off the plug and carefully and safely join the cable to the lamp cable. other LED drivers may have flying leads to wire up to or just terminals to connect a plug and the lamp onto.
This may be something beyond what you wish to do, but is really as simple as it comes, however it does require some knowledge and a safe approach to electricity.
Occasionally manufacturers allow the bulb to work with 12 Vac supply, however if they are designed for dc the life time of the bulb will be reduced when using ac. A transformer would supply an ac output.