Heat your griddle up to medium heat (about 300 degrees) and spray with cooking spray.
In a medium bowl, whisk the flour, sugar and salt. In a separate, large bowl, whisk the water, oil and baking powder until frothy. Add in the vanilla and kefir and whisk until combined.
Add the dry ingredients in and whisk until just a few small lumps remain. Fold in the blueberries.
Pour by scant 1/4 cup fulls onto the griddle and spread out JUST slightly. They spread a lot once cooking and you don't want them too big or they are hard to flip. Cook until the edges are set, the underside is nice and dark brown and bubbles form in the top, about 3-4 minutes. Flip and repeat.