One of the two conditions needed for משקה הבא לאוכל (squeezing liquids onto solids).
is one allowed to leave the food in the bag after being opened;
The Question of Totally Rubbing a Cream or Ointment into the Skin. Wiping Off the Excess Ointment That Was Dabbed On. How to Work...
wiping one's hands or mouth on a towel when they are dirty from colored foods or drinks (e.g., grape juice, pomegranates, colored ices, etc.);