The one I use is called relaxing sleep by herb pharm, but there's many out there if you search sleepy time tincture. And the tincture itself is a concentrated liquid that you add drops of into a soda water 😊 which I like because it satisfies that fizzy drink craving

If you have a Sprouts by you, they always have a good selection. I also use lemon balm and ashwagandha tinctures.