Lizzy, I hope the duck comes back. I've noticed with my muscovies that they really don't like to be separated from the group so hopefully that will be the motivation yours needs to return. I agree that coming inside and giving him some peace and quiet is more conducive to encouraging him to come into the yard when he does come back.
I bought a canner a couple of years ago and have used it a LOT for pressure canning - I love it. I actually haven't done as many batches as I thought I would have by now as my plan last year was to grow so much that I could can enough to keep us going over the winter. Well, with the hot summer, my garden didn't do that well, so I didn't have much excess.
One thing I learned to do that I've really liked, is beans. I like to use dried beans in cooking but by the time I'm ready to cook, I don't have time to do the overnight soak thing. So I took a bunch of different dried beans, and cooked them in the pressure canner. Now I have a ton of canned beans ready to use at a moment's notice. DH thought it a waste of energy to run the canner to do the beans, but usually what I do is get a load of stuff ready to can and if the canner isn't full, add enough jars of beans to fill it up. That way I'm not using any energy I wasn't already going to be using to can the other stuff, and over time I've built up a good collection of beans.
I got my canner on eBay. I knew how much they were on Amazon, so I kept bidding on eBay until I got one for less. I knew what my top bid was going to be and it took a few weeks but finally I got one for about $10 less than the same one on Amazon (and it was new). Plus, the seller threw in a bonus. When FedEx delivered my package, I was expecting only one box, but there were two. The second box contained a case of the large, wide-mouth jars. Such a bonus because I use the wide-mouth jars anyway, so already had the lids.
Lizzy, did you say you're going to be in triple digits this week? Let me just say I'm glad I don't live where you do. It is only forecast to be 90 here today and that is quite hot enough for me, thank you.