Consider that we have A, B, O, and AB with both positive and negative variants as the most common blood types.
Unless you're O+, you will reject the blood causing a massive immune response.
Having the something that works like blood, the body won't reject, and has a shelf life longer than actual blood is hard.
The blood rejection is reaction between blood plasma (with cells produced by your immune system) and red blood cells.
My partner has had severe anemia, and because of a prior transfusion went from being an easy match (A+) to a being a 1 in a thousand match. The last time she needed blood it took 12 hours to locate and transport suitable blood.
If you read the literature on survival rates for people with very low hemoglobin level, it's all based on post operative recovery (or otherwise) of Jehovah Witnesses