I've read that you can eat/drink according to blood type, like o+ may experience upset stomach with black tea. are there qualities per type?

Yes, however...: Yes, certain types of health problems are more common in certain blood types- for example, type o's have a higher risk of peptic ulcers but type a's have greater risk of stomach cancer. But we have thousands of genes ; to base your whole diet on a single gene makes no sense to me. See http://www.Earthsave.Org/health/bloodtyp.Htm for a brilliant detailed critique of the blood type diet.

No (just tales): Different groups of peoples can have different responses to certain foods or medicines, due to genetic or environmental variations among groups, but those responses to foods or medications are not caused by their blood types. They may have certain blood types, by coincidence, along with certain responses to particular foods. Example: native south americans are usually o's, but asia has many b's.