After I've been on a night out next morning when I pee I get blood in it! But after a few cups of water it goes away?

Here are some ... Seeing blood in urine with spontaneous clearing-up deserves a professional evaluation + care + counseling to make sure of no tumor especially in the elderly. So, bring the detailed Hx of the symptoms stressing their quality, quantity, and sequence of events to doc for analysis + exams + tests so to deduce possible Dx for reasonable Rx/ care/ counseling for now and future.