Just a couple of things about drip acclimation:
First, many shippers just drop the anemone into the bag dry. The water expelled from its tissues then fills the bag. You may not agree, but people do it that way. It is akin to dry-shipping stony corals. Subsequent acclimation of an anemone shipped in that fashion is of questionable value.
Second, people need to "do the math" when it comes to drip acclimation. I just finished an article for TFH, here is an excerpt from it about drip acclimation rates:
"...the name "œdrip acclimation" is a misnomer. It should be termed "œflow acclimation", as the rate must be faster than a drip. If one were to set up a drip line at one drop of water per second (as many home aquarists have assumed would be an appropriate rate) it would take FIFTY hours to equilibrate the difference in water parameters between one liter of shipping water and the receiving tank to within 90% of each other! Obviously, the flow rate must be faster than that. A flow of one milliliter per second would result in one liter of shipping water reaching 90% equilibration in 2 1/2 hours..."
In addition, the flow rate must increase during the course of the acclimation if you intend that the acclimation rate remain constant.
As Slickcg33 said, if the water is fouled (usually is) then acclimation can actually be harmful, I just slit the bag, and gently slide them out without letting the shipping water into the tank. Placement of the anemone is of course important, and people may need to shut off water flow devices until it has had to reattach.
Jay