If you already have almond and/or cashew meal (Trader Joe's sells them), add all ingredients except the water and cocoa to a food processor and blend until you achieve a cookie dough consistency, adding water one tablespoon at a time if needed to make dough (if you use peanut flour--I like PB Fit--you will need to add a couple tablespoons or more of water). If you are starting from whole nuts, grind those first into a fine meal before adding the other ingredients, being careful not to over-process into nut butter.
Once you have a sticky dough, dust your clean hands and a plate with cocoa powder. Roll the dough into bite-size truffles coated with cocoa.
These keep best in the fridge, but should be fine without refrigeration for several hours on the trail.