What is the best thing to take for cronic constipation other than laxatives?

Other approach: One of the best programs for bowel rehab focuses less on intake and more on schedule. Stool that spends too much time in the large intestine tends to dry & bulk up. Some people have developed a slow emptying pattern that perpetuated the process. I find that those who plan scheduled evacuations, several times a day, regardless of urges, can improve the rhythm & effectiveness. Takes ~ 6mo but helps.

Fluids: Drinking 80-100 ounces of non caffeinated non alcoholic fluid daily will correct most chronic constipation issues in 2-3 weeks, but you have to continue the regimen from that point on.