Khenpo Sodargye
When I was in the hospital, I often had to get blood drawn for tests, sometimes more than ten tubes at a time. Although this blood wasn't for giving, I thought that perhaps some hungry spirits who consume blood could benefit from it. So, every morning when the nurse came to draw blood, I'd be drowsy but I'd think of the Buddha's stories and recite a short giving prayer. Afterward, I'd ask how many tubes they drew and then recite the dedication verse: "Sonam diyi..." The nurses probably thought I was strange, mumbling to myself while they took my blood. In reality, it's a great way to use your own body to practice a small act of generosity.
If you find yourself bleeding in daily life, you can offer your warm, fresh blood to those unseen beings who need it. For instance, before surgery, you can recite a Chod ritual or visualize this: "Although I am not directly offering my flesh and blood, since the blood is going to flow out anyway, if there are any non-human beings who desire it, may they come and enjoy it. Through this surgery, I hope that all beings who seek to collect a debt, take revenge, or harm me will be satisfied. I offer them the flesh and blood removed during this operation. If you want it, may you take it with joy."
Many hungry spirits and yaksha-like beings are in great need of this. If we perform a dedication, it's like giving them permission to use it. This allows them to receive it. Otherwise, hungry spirits are extremely weak and cannot use it without authorization. It's like how we're afraid to touch someone else's things unless the owner willingly gives them to us.
So, even though we may not have the capacity for great acts of generosity like the Buddha did in his past lives, we can start with these small acts.
