You can buy alcohol most anywhere,but there are 2 grades you want the 99.9% for your race-car.The lower grade is for industrial use,mostly for cleaning. I do not remember what percent it is,but the 99.9% is pure alcohol and that's the one you want.Most places sell both grades,I have been told the industrial grade is refined alcohol.
PS what the Hospital use's may not be the 99.9% if it is it will say it on the drum.