Good news for those rooting for the Vacation preservative in my ongoing trial: My tree hasn't soaked up the least bit of water since I filled the reservoir nearly 36 hours ago. Ordinarily, this would be bad news, indicating the tree was past the point of no return and unable to "drink." But because I added the product, it's highly possible the tree simply doesn't need any water. Also, this morning's inspection revealed no more needles have dropped.
Still too soon to call, but I'm feeling optimistic. I'll report back tomorrow.