If you've already got a picnic tap, take a look at the BMBF
. It uses your picnic tap, a short piece of racking cane, and a stopper to put a little bit of backpressure while you're filling up your bottles. I'll second chilling your bottles as far as you can, the colder they are the less co2 will come out of solution when you fill them. Otherwise, just remember to cap onto foam to keep oxygen out and you should be good to go!