Dip the corals in something like Coral Rx.
Remove them from the plugs (if possible) and reattach to your own, new plugs.
Dip acclimate everything.
I've got a one gallon jug that fits inside of my 5 gallon buckets. I'll pour the contents of the bag into the jug and drip into the gallon jug until it's full. If it over flows, that's fine because it's sitting inside the 5 gallon bucket.
Once the jug is full, I lift the jug out of the bucket and pour about 1/2 into the bucket then pour the rest back into the tank.
It works for me. Sometimes I forget that I'm dripping and the 5 gallon buck has save me a lot of clean up.