There is no special diet. Just common sense. It should be vegetarian. Other than this the diet would depend upon the prakirti of the person's mind and body. Anything which digests well and does not produce acidity, gas, bloating, sleepiness is okay. Anything which produces heaviness and constipation should also be avoided. Food should be eaten not for pleasure but for proper health and living.
If you are young and digestion is strong and then 6 rotis is may not be too much. But in later life 6 rotis would be harmful for health. In fact even in young life it is better to have more of fibrous vegetables(gaajar, matar, gobhi, pata gobhi, broccolli, mooli etc) and less of grains.
Water should be had in required quantity. Have a little with meals to make the meals settle in stomach but not too much because digestive acids need to remain concentrated. After about 2 hours of the meals one can then have more water. This will help the food to remain moist and watery and move forward from stomach into the small intestine. Having water first thing in the morning is a good idea to keep the digestive tract clean and to help relieve constipation.