5 Blood = 1 Blood Sausage
250 Blood = 50 Blood Sausages
2500 Blood = 500 Blood Sausages
You have two ways of getting a lot of blood quite easily:
• The first and fastest way is to get Demon Blood which you then purify at Jhebbal T2 altar, each one gives you 5 Blood → 500 Demon Blood = 500 Blood Sausages
• The second which is easier to acquire but much slower to process, is to harvest Zathite Bags from spiders (2 per spider with the Efficient Harvest Perk) throw all the carcasses in the Fluid Press first, then all the skulls, and you’ll have too much bones and blood 
It doesn’t cost that much really, and if you noticed at the end of the video, only about one stack and a half was gone so maximum 100 Sausages = 500 Blood = 100 Demon Blood. Pretty cheap when you know where to farm what 
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