Step 1: What you will need
A clear plastic sandwich bag (you can get these at wal-mart or any other grocery store).
2 1/2 cups of water.
A bottle of lime juice.
2 teaspoons of salt.
Two or three paper clips
And some shiny pennies.
You will also need a bowl and a spoon which is are not in the picture.
You should have these things around your house. Therefore, they should not be that hard to come by.
Step 2: Add the water
Next add two teaspoons of salt. (table salt will work fine)
Mix it with the spoon to get the salt off the bottom of the bowl.
Step 3: Add the lime juice
Step 4: Add the mixture to the bag
Then drop the pennies in to the mixture. Seal the bag and this is what you should have.
Step 5: Add the papper clip
First off bend, the paper clip like so. It will make it simpler to add to the bag.
Now slide the paper clip through the top of the bag. Make sure it's above where the bag seals.
Feed it through the rest of the way so the top of the bag is in the middle of the paper clip. If you don't understand look at the third picture.
Finally push the part of the paper clip that was out in so that it will have a stronger connection.
Good job you are almost done.