Black Gulch has one soon as you enter it. Sinner's Rise has one soon as you kill the boss. --- We are living in a world today where lemonade is made from artificial flavors and furniture polish is made from real lemons.
iirc from the Black Gulch just head back up the path to the Gutter and it's right next to the stand you light with a torch. Or you can start at the central gutter bonfire and take those ladders all the way down and drop down the hole in the wall covered by the corrosive jars.