Winwin :
This boy would be all sunshine and rainbows when he saw you walk through the door with food just for him.(not that he isn't sunshine and rainbows already) He'd just feel so lucky to know that you were thinking of him and his well being.
Taeyong :
Shy baby right away. Especially if it was in front of the other members. Taeyong couldn't help but smile and thank you a billion times. He knew that you didn't have to go out of your way to do this for him so knowing you cared that much for him meant a lot.
Haechan :
Haechan would try to hide how excited he was for the sake of not getting terribly teased but he would fail because he loves you so much. He wouldn't be all hugs and lovey in front of the other members but the next time he sees you alone he'll thank you very sweetly.
Mark :
He wouldn't even see the food at first because he was so happy to just see you. Because of his full schedule he didn't get to see you as much as he wanted and then when he noticed you had food with you he fell 10x more in love with you.