As we know that all of the people always like to take foods those have sufficient fiber because they know very well that because of low 
fiber people can suffer from constipation. Sometime people get lack of water in their body which is biggest reason of dehydration. If you have dehydration then you may suffer from constipation and also you can suffer from many other problems. What problems you may have because of constipation? If you have constipation continue for few months then you will get increment of your weight and fat. As we know that many people are looking to lose their weight so this may be the big problem for you. You may also suffer from heart problem. Because of continue constipation people get pain on their heart.
If you do not like to drink water much then you should take foods those have much fiber because you will not get lack of water if you will take much fiber on your body. Fiber is good to control constipation and dehydration. You will never get dehydrated if you will take much fiber or if you will take water continue. You have lots of foods and fruits those have much fiber and also those are good to control constipation and dehydration. You can also take salt in extra quantity which will be great to control constipation and you will take lots of water in a day. Salt is really great to have control on constipation. You should avoid coffee and tea because these may be the reason of dehydration and constipation.