Cementing 1/2 inch CPVC in crawlspace
Bread is an old trick, however use Wonder Bread, which will dissolve nicely after you turn the water back on. High quality wheat and rye bread dissolve poorly. An alternative is to purchase a freeze plug device, this is a magnetic cooling unit that clamps around the pipe, you apply current and after a few minutes the water freezes. Works very nicely, but costs a lot more than a loaf of Wonder Bread. By the way, Hostess is out of business, so you may have a difficult time finding Wonder Bread, so the option is the cheapest white bread made. Just curious, why is this an issue, you used a shark bite?
The water likely kept dripping because gate type valves, often used as shut offs, are almost never leak tight. Sometimes terrible things go wrong, like the valve fails in the closed position, creating all kinds of issues. Much better are the quarter turn ball valves, more reliable, better seal, last longer. Also cost more.