When I do bondings I use a 5 x 2 pen, I usually start off with a litter tray which has been cleaned out with neat vinegar (a new one is ideal), however if any of the buns you are bonding starts taking control over the tray it is removed very quickly.
I offer lots of different hays slowly giving them different ones over a period of time just to distract them. I put on one side the normal amount of fresh veg and pellets I would feed in a period of 24 hours, the veg is cut up very small and I slowly feed this over the period of the day. I dont use a bowl as this often ends up with fighting over it, I either hand feed or sprinkle little bits, usually finding out quickly from the buns what works well.