Assuming by can you are referring to fast pitch? An old clean plastic bottle should work just fine, just make sure to clean thoroughly and sanitize it first. Whenever you walk by it once you've pitched your yeast, give it a swirl, don't need to have a stir plate. You can dump the entire volume of your starter in your beer if you'd like, or you can cold crash it a bit and decant the liquid off the top if you're concerned about it. Leave enough wort on top to swirl the yeast back into suspension and let it warm up to room temp again, then pitch that. I wouldn't worry about adjusting your target starting volume for the yeast pitch personally. I've taken to increasing my starting volume to get enough wort to use as a starter for 6-8 hours and then just pitch the whole thing in when it's ready.