"Maybe." William took down another jar of something shriveled and dried, and held both in his hands. "Possibly."
He needed parchment. "It's been a while," he warned Jon as he set the ingredients down on the table and conjured a quill neatly into his hand. Most of the potions he didn't have a chance of reconstructing, not with as quickly as he'd read, copied, and dismissed the instructions. A few, though, the more successful and useful ones, he'd had to copy down multiple times and then hold briefings on with various Auror teams. Those he used to know inside out. He didn't know whether he still did, but it was worth a shot. The worst they could do was...well, blow themselves up accidentally in the attempt. That was a worst-case scenario, though.
He scribbled down a list of everything he could remember off the top of his head, including Gabe's various comic asides. The actual instructions would be harder to remember, but he had somewhere to start.
The vetivert grass wasn't right. That belonged to something else. He scratched it out and made a new list on the other side of the parchment, scribbling down ingredients by memory until enough clicked and he wrote at the top of the page, underlined, Sonic Boom.
Gabe had a fully stocked workroom, hopefully with access to all the ingredients he'd had and used during the war, and there were more than a hundred House-elves theoretically between them and the library right now. William looked at Jon, refocusing briefly. "How are you at making potions?" he asked, holding out the list so Jon could check the closet for what they'd need. "Because I'm..." Abysmal was slightly strong. "...not great."