Law of Inertia: Objects in motion stay in motion until a force acts upon them. Objects at rest stay at rest until another force acts upon them. Like this table cloth. If I pulled it out from under a cup, the cup wouldn't move because there is no friction pulling it there, so it stays at rest. I just have to do it fast enough.
Newtons Second Law: The more force exerted on an object, the more it will accelerate / slow down, depending on the mass. More mass makes it harder to accelerate / slow down. So, If I tried to push my Big brother, it would require more force. If I push my Little brother, it would be easy.
Newtons 3rd law: Every action has an equal but opposite reaction. I go through the water by pushing on it. Using Newtons 3rd law, the water, for me to accelerate, must also be pushing on me. So, I push the water backwards and it pushes me forwards. Equal and opposite reaction.