Need help with LEDs and a commission if anyone is interested

Hey guys as of right now I need to run 6 5mm cool white LEDs. Will 2 double a batteries be efficient ?

Also I've got a commission for anyone interested . I would like to change out the AA's to be able to plug into the wall. Can anyone make me a string of 6 5mm cool white LEDs that can be plugged into the wall?

Please let me know
Thanks!