Reins are tricky; they have to go first, otherwise you might lose them if you have another item in inventory, which sucks.
/use Ram Racing Reins /use Complimentary Brewfest Sampler /use Elekk Dispersion Ray /use Wolpertinger Net
This one saves SO much time while trick or treating, since you can’t drag the Handful of Treats on to your action bars.
/use Handful of Treats /use Dousing Agent /use Arcane Cleanser /use Water Bucket /run UIErrorsFrame:Clear()
One option suggested by Lara is to add in G.N.E.R.D.S to make it easier to rebuff during PvP. This is good, but it can also make it so you use up your stash of candy in inappropriate places – it might be better to put it as part of your buff macro.