After a while those ice machines are more of a pain than the pain they relieve! Heavy, sloppy, consume ice like crazy (or force you to devote most of your freezer to freezing little water bottles), tug on your knees and never get all that cold. I'm retiring mine for use as a travel cooler. I've been using gel packs, as well as a "Bonesmart Slushie" bag (1:8 parts rubbing alcohol:water frozen in several thicknesses of gallon-size ziploc freezer bags). The latter gets incredibly cold and like the gel packs can be refrozen many times. (I don't bother with frozen peas or corn--the slushie bag is cheaper, won't spoil if left out too long, and I have quite a few gel packs).
I'm only a week ahead of you--glad to see you've abandoned the notion of taking your hydrocodone 10/325 only twice a day! I'm still unapologetically taking 4 or 5 of them a day. Your knee wants what it wants, and if you don't stay ahead of the pain these first few weeks you will be even more swollen, achy and depressed than normal. Even if you choose not to do active formal PT (visiting or outpatient), you can't differentiate as easily between pain and discomfort when it comes to your gentle home exercises and you can end up looking for any way to avoid even the slightest bit of walking about the house. And that in turn sets in motion the cycle of misery and despair. It's way too early to be stoic!