Preventing many diseases is as simple as providing safe, clean drinking water. Emergency water filter pouches help to do exactly this. They are filled with sugar syrup and salt. You drop the pouch into muddy water, and after a few hours, the pouch fills with enough drinking water for a whole day. The flavor is like a sports drink. Which of the following could explain how an emergency water filter pouch makes a safe drink out of dirty water?

The pouch is a semipermeable membrane. Water moves into the pouch by osmosis and dissolves the syrup to make a safe drink.
The salt and sugar in the pouch pass through the pouch into the water by facilitated diffusion. They kill any germs in the dirty water, making it safe to drink.
Dirty water passes into the pouch. Microorganisms are pushed out of the pouch by exocytosis, making a safe drink.
The pouch brings in water by endocytosis. The water combines with the salt and sugar to make a safe drink.