Based on the history you provided, it is likely that your cat suffers from lower urinary tract disease. Please read the article below about the different presentations of this disease, but bear in mind that blood in the urine is a sign of potentially serious disease, and a visit to the veterinarian is recommended ASAP:
We are moving and the cat is very stressed. He eats and drinks regularly and uses the litter box but puts a drop of urine on anything that is on the floor. It seems to contain a drop of light colored blood. He is sensitive and the other cat seems to have no problem.