Drinks that help you poop are drinks that contain fiber such as prune juice, apple juice, grape juice, pear juice, vegetable juices, etc.
Eating apples, grapes, prunes, pears, other vegetables etc can help you poop.
Also increasing your water intake can make you poop and keep your poop softened so that you don't have hard poop and have to strain to poop.
The absolute best drink to drink when you are constipated and need to poop is prune juice as prune juice is a very good natural laxative.
If you drink enough prune juice or eat enough prunes you can be pooping within a few hours as your stomach will start cramping up and you'll be running to the toilet.
Also figs are good for eating when you need to poop and taking some Metamucil also helps you poop and keeps your bowels clean.