The potions, you cannot get. If you want to get over there, you will need the Ice Pencil from lvl 6.
You have to step on the feather, then get the egg pencil, then draw a egg in any blank nest, then step on the feathers. The one where there is a hole you have to mine the stone. You cant get in the hole anyways.
Then walk right until you see a cart and some batterys. Hook the stuff up, then press the button. Then follow the cart. Then you will see a rock and a Checkpoint. Mine the rock to get to the checkpoint. Then go up to the next checkpoint. Then you can activate the battle. You should get your pickaxe out. Before the huge battery,you need the wire pencil, then you trick the boss snake into eating the battery. Then you will get the page.