I want to send a bottle of milk to the person I like every day and put a sticker on the bottle. Don't know what to write for help.

It's better to be different every day. You can write different words according to different situations. For example, if the weather changes, you can write something with an umbrella to keep warm. If the other person is in a bad mood, you can write some words of encouragement and comfort; You can also write something about your feelings and so on; Or find a little joke, humor, famous saying or something every day. You can also pay attention to topics of interest to the other party, such as sports, music, etc., and you can prompt what games are there today or what songs are good to listen to.