When I first starting collecting Amaryllis in 2003, the information I read said to provide no water during the dormancy period, until just before you want them to break dormancy.
I would force the bulbs during the holiday season when I first obtained the bulbs, than keep them going during the warm season, reenter dormancy than bring them out in the spring, which in MN can be anywhere from early April to early June, typically early May and have them bloom in late spring to early summer
I noticed that there was always a lot of shrinkage and flower production seemed to decrease.
Surly in their natural habitat they must get some moisture, though very little during the dormant period, so I would provide just a very small amount of water to the containers, approx every 4-6 weeks during the dormant period, the flower production seemed to be much better and the bulbs appeared much more robust when I put them out the previous spring after I had withheld moisture during the dormant period.
Additionally I traveled to Amsterdam a lot, I asked one of the plantsman in the floating market where I got most of my Amaryllis about supplying moisture during the dormant period, he said "of course"
This past fall, I was gone a lot and did not supply the supplemental moisture during the dormancy period. The bulbs were much smaller, flower production was way down from my past years, this was on all of the 32 plants.
Going back to giving moisture during dormancy.
