Then, start by adding the egg whites in a bowl and the apple cider vinegar, then mix well using the hand mixer.
Then, In another bowl, add almond flour, psyllium husk powder, coconut flour and salt, stir together.
After that, add the dry mixture to the egg whites mixture and mix with a spatula.
Then add the water and stir slowly.
Put the batter in a well-greased loaf pan.
Bake for 45 minutes.
To store: Keep the bread covered in the fridge. It will last for 3-4 days.To freeze: Slice the bread and wrap the slices individually in a plastic wrap and keep in the freezer for 1-2 months.Reheating: Thaw a slice of the bread at room temperature, then reheat in the microwave or in the oven.