Although, not technically Humbolt Park......
Miraim at IRAZU (Milwaukee -south of Armitage) serves up some very yummy ones- including my favorite - a "Mamey" licquado, Papaya, mango Strawberry, and lots of others including an "oatmeal" one as well..
A recent "find" includes JUGOS NATURALES- 2943 W. Irving Park- where I had a great "aqua de Melon" and a Mamey licquado- full of flavor- and lots of "energy" supplements avail. as well- kind of a Latin/in-da-hood version of Jamba Juice....plus they have sandwiches as well (I wanted to try the "Cubano"- but was already full from my Licquado)