Step 1: Buy Heavy Duty Plastic Sheeting
I recommend a basic blue tarp or heavy duty plastic sheeting that can be found at any home improvement store or here on Amazon. You’ll want to buy one that’s long enough for a good slide. I recommend a sheet or tarp that’s 100 feet long. That way you’ll be sure to have as much as you can possible want but you can fold it if you don’t need all 100 feet.