I have decided that I would like to install a bubbling boulder beside my sidewalk in front of my house. I have never tried to build any water features and have searched the internet on how to do this. I have a few questions for you guys that do this alot. First, I would like to keep my cost as low as possible, so do I have to buy one of the reservoirs I have seen for $300 - $500? Can I just use a big plastic storage container or tub, or just dig a hole and line it with a rubber liner? What size pump do I need? If I have to drill the hole myself, how is the best way to do it? Will a sandstone boulder work alright?