One of the simplest ways of growing oyster mushrooms is with paper. My first attempt was with paper and
cardboard in pill bottles with some blue oyster mushrooms that I bought at the grocery store.
I just boiled the paper, squeezed out the excess
water and packed it into layers in the pill bottles with a thin slice of oyster mushroom between each layer of paper. The more mushroom to substrate the quicker the mycelium can take over the substrate and the less likely you are to have issues with contamination. I then drilled some small holes in the sides of the pill bottles and placed some medipore cloth tape over the holes. Then I put them inside a
coffee can with the lid on it and put on a shelf not far from the fireplace where it stay around 65 to 75F and just kept checking them regularly until the paper was all grown in white with mycelium.
I took them out of the can and put them under a suspended upside down bag near a window in my bedroom where it stays about 55F and just misted some water in there several times a day to keep the humidity up and voila.. My first mushroom growing success... Was nice after so many failures and after buying materials so many times. This was cheap and effective..
I then took my grown oyster mushrooms and tried doing a bag of substrate with them and all looked good for a bit then it was taken over by mold and it all just rotted...
From everything I have studied it seems the easiest and most successful oysters grown by newbies seem to be on
straw, paper and sawdust or
wood pellets. Paper, and wood pellets being the most free of contagions and not requiring pressure cooking the substrate. The straw and sawdust may need to be either pressure cooked or cold pasteurized with lime and water before you use it as it may have mold spore in it.