In a bowl, add all flours and salt; mix well. Add buttermilk and water, mix well without lumps. The batter should be thinner than the regular dosa batter consistency
Add all the other ingredients listed except oil and combine well. Keep the batter aside for 10 - 15 minutes
On medium flame, heat a non stick/ iron dosai pan. Check for the batter consistency, and if it has become thick, drizzle 1/2 tbsp of water
Once the pan becomes hot, take a ladleful of batter and make an outer circle; because the batter is thin, it will be spread in the middle. If required, fill a small portion of batter in between. Drizzle oil and cook on one side; after it is cooked, carefully flip to the other side. Instant wheat dosa is ready; serve it with chutney/sambar/thokku