A once-in-a-lifetime blood transfusion

Zhang Zian had a small amount of bottled water in his backpack. It was for emergency life-preservation in the event that he couldn't find a water source. However, he had never encountered a water shortage along the way, so he had not used it.

He took out a bottle and washed a cup of water. Then, he used a syringe to extract a certain amount of pure water and heated it slightly on a candle. He then used the small scale in the kitchen to weigh a certain amount of sodium acidic Aqua and mixed it together while shaking it evenly. Although he was not particularly accurate due to the limitations of the conditions, he could roughly achieve a concentration of about 4%.

After shaking it well, he used a 50ml syringe to suck 5ml of sodium acidic solution. A ratio of 9 meant that 45ml of blood would be drawn later.

Famous, you can put down your paw. We'll need to draw blood from the cervical vein later."