I'm fond of the PATCHA brand, Sorbet and Purple Mango in particular. The latter isn't much like OG mango, fair warning, but you'll probably like it if you were

I'm fond of the PATCHA brand, Sorbet and Purple Mango in particular. The latter isn't much like OG mango, fair warning, but you'll probably like it if you were a fan of the old school. The trick with refilling is to press the sides in when replacing the rubber stopper. If you do it right, you'll see a bubble or two rise up from the bottom. If you skip this part it will leak everywhere. Also, blow through the cart several times to clear the tube. It's a bit fiddly at first, but you'll get the hang of it.