Preheat oven to 180c degrees. And grease 2 x 16cm cake baking tins. In a medium sized bowl, sift together all dry ingredients. Add vinegar and coconut oil, and give it a good mix. Add water, and mix again but make sure not to overmix the mixture. There will be some lumps left but that's ok. Pour mixture into your prepared greased baking tins, and bake until a toothpick comes out clean from the centre of the cake. Take out of the oven, and let it cool down on a cooling rack until it's ready to be frosted.