Now build a chute 2 blocks out from the hole. Then make sure it is walled on all sides and then add 2 blocks making a 2x2 one block on top of it. Then box it to match the third image. Then make all the walls match up to the height. After, add three signs, ont in the hole and 2 on top. If you put it correctly, and add water in the correct spots like i did, it should flow exactly like mine. Then put the blocks on top of them to make it a 2x2 (remember, put it one block higher than the water! We don’t want the water to stop). The signs are crucial because they stop the water from falling. The. Build up and connect to the spawn platform. (Remember the water will flow perfectly on when it’s 4 blocks diagonal from the 2x2 drop. Remember what I just showed u is to make it fall into a 1x1 hole. It is not necessary To do this. You can build the whole drop 2x2. Also hostile mob spawners do not follow the normal spawner rules in Minecraft. They can spawn in any light level and will spawn even when you are far from it. At the bottom of your farm, put a hopper pointing into a chest. If you are killing stuff like pigs, you can point hoppers into a furnace that will deploy the cooked food into a chest. This is my cooked pork chop farm results after about 4 days.
Edit: I AM SUPER SORRY! MY PHOTOS DID NOT GO IN THE ORDER. Plz make sure the photo matches what I am saying.