Blend the water together with the spinach until very smooth.
Add in the olive oil and blend briefly (5-10 seconds, just long enough to incorporate).
Mix the dry ingredients together in a large bowl (flour, baking powder, salt).
Make a well in the center of the dry mix and add in about 1/2 of the spinach water.
Stir until the water is absorbed and continue adding spinach water until the dough is well moistened. Note that you probably won't use all of the spinach water.
If the dough becomes sticky, add in a little bit of flour at a time until it's not.
Knead the dough for 3-4 minutes until it is smooth and there are no dry patches. It should NOT be sticky!
Cover the ball of dough with your mixing bowl, and let it sit for 15-20 minutes.
Divide the dough into eight equal pieces.
Begin to heat a large non-stick or cast iron skillet over medium high heat.
Flour a surface and begin rolling out the balls of dough (about 1/16" of an inch in thickness); use a clockwise motion to roll them out and create better circles. If your rolling pin begins to stick, add a bit more flour.
Place the tortilla into the heated skillet.
Heat the first side for 15-20 seconds or until you begin to see small bubbles form.
Flip the tortilla and cook the reverse side for another 5-15 seconds, as needed.
Place the cooked tortilla onto a large plate and immediately cover it with a dish towel. This locks in heat and moisture so as to keep the tortillas soft and pliable!
Repeat these steps with the remaining balls of dough, placing all the tortillas in a stack on the same plate. Be sure to re-cover the plate each time you add a tortilla to the stack.