Each item in Minecraft has a unique ID assigned to it, known as an item ID, this can be used in commands to spawn the item into the game. The item ID for potion of slow falling (4:00) in Minecraft is shown below:
The Potion of Slow Falling (4:00) item can be spawned in Minecraft with the below command. Cheats must be enabled before this will work.
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After consuming this potion, you will be given the Slow Falling potion effect for 4 minutes, which, as you might have already guessed, makes you fall slowly (as-if gravity has a lesser effect). You will also not take fall damage and be unable to break crops by jumping on them.