Dietary measures:

A high fiber diet ensures bulky stools which retains water and remain soft, making it easy to evacuate.
As opposed to this, a diet low in fiber generates a smaller quantity of faeces  which retains less water and becomes hard.
This can excoriate the anal skin at time of evacuation leading to fissure and bleeding.

How should a high fiber diet be constituted?
Indian meals are traditionally rich in fiber. All it takes is to identify the specific food items and  to consume them in adequate quantity.

Here is a list of high fibre foods :

Should I avoid nonvegetarian and spicy food?
Such hardship is not at all necessary
As long as you eat a sufficient quantity of high fiber food in your meal, any additional nonveg food will not cause the existing fiber content to reduce.
Similarly, spicy foods do not contribute to piles.

Laxatives:

Traditionally form a part of the conservative treatment. They act by creating soft stools that are easily passed without straining.
Caution : Unsupervised use of laxatives can lead to habit formation.

Bulk Agents:
A popular technique used to ensure soft stools. Generally psyllium husk (isabgol) is the ingredient available as a powder which when mixed with  water forms a flavored drink. When taken at end of meals it acts like an artificial fiber supplement
(as opposed to natural) and help to form a bulky stool.

Lifestyle /habits tending to promote piles: