Hi I suggest you to avoid  Consuming Spicy food Coffee, tea, carbonated drinks , alcohol Avoid Smoking Avoid red meat I advice you to take your meals at regular intervals in small quantities 4 to 5 times a day Just drinking plenty of water might not solve constipation you need to Add fiber rich foods to your  diet such as green leafy vegetables, Oat meal, fruits such as banana can be helpful You might be suffering from Irritable bowel disease