My classmates in the class want to donate blood and want to buy some consolation items. What can I buy that is convenient and good to eat?

When donating blood, the blood station will deliver milk, calcium gluconate, calcium tablets, etc., and calcium supplement foods. If you donate blood components, you will receive souvenirs such as water cups, umbrellas, etc. with the voluntary blood donation logo printed on them, which is very meaningful. If you eat, mainly calcium, water and protein supplements, such as milk, soy milk, Nutrition Express, etc. Chocolate adds calories, so you can prepare some if possible. The main thing is to encourage mentally. After all, it is a free blood donation. Praise more, but don't donate blood blindly. After all, students (I don't know if they are college or high school), if they are in junior high school, they should do what they can.