The easiest material to get for this are the small stones and stones, you can forage them around the mountain path from the beginning of the game. Bottles can be fished from the rivers and are found randomly. (You can either find them by hand fishing / swimming, or fish them up with a pole.) The glass stone can also sometimes be found while hand fishing and swimming (although this is rare.) You will most likely find Glass Stone in the mining area located in the Safari. Unfortunately you have to wait till Fall of Year 1 to unlock this area.