White vinegar is key here, not apple cider. Apple cider vinegar can have stuff in it that clogs the stems, I think. @the_ben, your ratio might work, but I use two tablespoons of plain white vinegar per quart of water. I mean, it's always worked for my hydrangeas, even in crazy heat. Maybe it's just me, but I also soak them for a full minute, no less.

Ever notice how floppy plants get stronger without stakes too?

Oh, I read something similar to what @evan_reed said about stopping. It really does help them figure it out without getting scared.

Tried plain white bread between wine samples once and it worked the same way, just a neutral reset. @the_jake water alone never cuts it for me either, everything just runs together.

Avoid copying blocks and retype everything to learn structure properly.