How are you making your tincture? If you're using alcohol to extract you don't need a crockpot. That's the method I use and it's super easy. Just decarb your weed, put in mason jar, add alcohol and wait a few, then strain. Whatever I plan on using for tincture I usually mix with about half vegetable glycerin to tone down the alcohol taste a little. Works pretty well for me, couple droppers and I'm good for a few. If you're using glycerin from the start then yeah I would assume you could use a crockpot instead since you have to heat it to infuse. You can use it to infuse coconut oil so I don't see why not. I've never done it that way but from my understanding it's a bit weaker than the alcohol extraction method. Hope that helps.