I don't see why your method won't work, but you should check out the dew collecting thread. We already have a thread for that. It's here at this link http://www.lost-academy.com/practical-alchemy-f1/dew-collection-method-t23.htm Also, my cousin and I used a 16 pound bag of ice that only cost $1.50. That by far has been the most successful method. We managed to get over 1 liter of dew in one night, and Nick himself said it is possible.