Make your own nondairy milk by adding the water and pecans to a blender and blending until mostly smooth. At this point, you can strain the mixture or leave the tiny bits of pecan in to add texture to the shake. I like to leave them in.
Next add the pumpkin, chia seeds, spices and your choice of sweetener to the blender with the nondairy mixture. Blend until smooth, taste and add more sweetener if needed.
Add ice and blend until it looks like a milkshake. Please note that if you do not have a powerful blender you may need to add the first ½ cup of ice and blend, then add more in ¼ cup increments until it’s as thick as your blender (or undertaker) will allow.
Make this nut-free: Substitute 1¾ cups of you favorite nut-free nondairy milk in place of the water and pecans.