What should be done for a bloody stool? wait it out?

Get help; don't wait: If you recently ate a large amount of red liquidy food (or similar-appearing stuff) then you may have rapid intestinal transit resulting in the food's inadequate digestion. However, be concerned since blood may also appear as red. Bleeding in such a case can be without warning, brisk, & originate anywhere in the gut (from esophagus, stomach, to rectum.Don't hesitate to seek urgent evaluation/care.