If you look closely at a penguin's bill you'll notice a hook at the end, perfect for grabbing dinner. They also have backward facing bristles on their tongues that helps slippery seafood from getting away.
Penguins don't live near freshwater - at least none that isn't frozen already. Instead they drink salt water. They have a special filtration gland in their bodies that takes the salt out of the water they drink and pushes it out of grooves in their bill.
