with this mix 1 to 1 you do not need to add water at all, also you should start with 1 lime 2 sand mixture and NO WATER added.

Work your way up to the "fatter" more lime mix if you want but 1limeX2sand is just enough:

http://www.dolphinfresco.com

the Dolphin Fresco is painted on intonaco 1-2 as well as Albuquerque Fresco