Minecraft wiki entry for Shelters, associated text: If you are in a desert with only sand and cacti all around, and have no other blocks available, don't use cacti (they'll kill you). If you have time, try to gather a lot of sand to make sandstone. If you got at least 40 or 50 sand (a full stack of 64 is better) by nightfall, you can make enough sandstone for a pillar, even without your crafting table: Press E for your inventory and crafting window, divide the sand among all four boxes of your crafting grid, and take the sandstone. (Use your pickaxe to take down the tower in the morning.) Unfortunately, you need 4 sand to get each block of sandstone.