However, withdrawal from caffeine is seldom dangerous, though it can make one uncomfortable for a few days. The most frequent symptom associated with this withdrawal is a moderate to severe headache. This can occur between 12 and 24 hours after last intake of caffeine.
Okay, for step one you need to get the command blocks in your inventory. Make sure you have cheats ON and say /give (player name) command_block. After you get in in your inventory place 5 in a row.
To get a command block using cheats, type /give @p minecraft:command_block <amount>. Behavior. When attached to a redstone circuit, the Command Block can perform a variety of server commands, such as changing the difficulty or giving players items. For more information, see the commands article (linked above).