Thanks to all those who sent recommendations on how to tape blisters. I went with duct tape for today's hilly 6-mile run and it held up perfectly. I rubbed some bodyglide on the actual loose skin where the blisters are before taping my feet so it wouldn't stick and pull off the skin (thanks L.J.). I taped from the top left side, under, then over the top right side of each foot (in other words, just short of a full wrap-around). When I got back from the run, my feet were just sweaty enough to make for easy removal of said tape.
As for the run, it was mostly to get in some hill work. The pace was between an easy run and a tempo run: 6 miles, 48:27 (8:04 pace). Even though the blisters may not be an issue now, I have a new concern. The past couple of weeks, I've noticed an increasingly sharp pain directly under my left knee cap. It's mostly noticeable going up and down stairs (or steep inclines), and when squatting or lunging. I don't feel it too much while running, but I'm a bit worried about it. Other than that, the half marathon training is going well. Less than two weeks away now!
Oh, as for last week: 4 runs, 27 miles.