If I'm filling just to take to a party and I will drink it that night I just grab a clean growler and will fill it using the racking cane in the tap with the stopper. If I'm filling and I know it's going to sit for days-months then I take the time to clean the tap and sanitize everything and chill the bottles.SenorWanderer said:first, read this, if you haven't already.
i think you're asking two different questions. i follow the post above to fill bottles for long term storage in the beer vault/giving to friends/entering in competitions. the key there is minimizing co2 loss and air gain. when i think growler i think take home beer from the pub that will be drank with in a few hours. if you're doing that then like DAAB said, chill the growler, reduce pressure, and fill like you're racking.