How to instill BCG in bladder? Just follow the steps given in the video and you will be able to do so, catheterize the patient with feeding tube in the same manner as you catheterize with foley's. Inject BCG in bladder, remove feeding tube, ask patient to make movements as crocodile does after eating his prey, so that BCG may spread to all surfaces of bladder, ask the patient not to void before 2 hours after BCG instillation.