How to soften stools?

No other disease?: Each person with constipation needs to be sure there is no other disease causing it. If constipation is just due to slow movement of the food and poop through the gut, then the things to try are vegetables, water, prune juice, prunes, fiber+water, Miralax, (polyethylene glycol) Senokot or other senna, milk of magnesia, other laxatives... A doctor can evaluate and prescribe helpful medication too. Exercise also helps.

Stool softener/fiber: First, be sure you are staying well-hydrated with a good intake of water or other fluids. Adequate fiber in the diet is also important to keeping the stool soft. If these things are not enough then a stool softener such as docusate sodium can be used.