Squidlike Survivalfly cmd

/summon FallingSand ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:FallingSand,Block:redstone_block,Time:1,Passengers:[{id:FallingSand,Block:activator_rail,Time:1,Passengers:[{id:MinecartCommandBlock,Command:gamerule commandBlockOutput false},{id:MinecartCommandBlock,Command:"fill ~2 ~-3 ~-1 ~8 ~-1 ~1 stained_hardened_clay 14 hollow"},{id:MinecartCommandBlock,Command:"fill ~2 ~-2 ~-1 ~8 ~-2 ~1 stained_glass 14 replace stained_hardened_clay"},{id:MinecartCommandBlock,Command:setblock ~1 ~-2 ~ wall_sign 4 replace {Text1:"{\\\"text\\\":\\\"SQUIDLIKE\\\",\\\"color\\\":\\\"dark_red\\\",\\\"bold\\\":true}",Text2:"{\\\"text\\\":\\\"SURVIVALFLY\\\",\\\"color\\\":\\\"dark_red\\\",\\\"bold\\\":true}",Text3:"{\\\"text\\\":\\\"by\\\",\\\"color\\\":\\\"red\\\"}",Text4:"{\\\"text\\\":\\\"RedstoneExpert\\\",\\\"color\\\":\\\"red\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"fill ~ ~-1 ~-1 ~7 ~1 ~1 air\\\"}}"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~ chain_command_block 3 replace {auto:1,Command:"/scoreboard players tag @a remove fly"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-2 ~ chain_command_block 5 replace {auto:1,Command:"/execute @a[tag=fly] ~ ~ ~ detect ~ ~ ~ water 7 /setblock ~ ~ ~ air"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~ chain_command_block 5 replace {auto:1,Command:"/execute @a[tag=fly] ~ ~ ~ detect ~ ~ ~ water 15 /setblock ~ ~ ~ air"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-2 ~ chain_command_block 5 replace {auto:1,Command:"/execute @a[tag=fly] ~ ~ ~ detect ~ ~1 ~ air -1 /setblock ~ ~1 ~ water 7"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~ repeating_command_block 5 replace {auto:1,Command:"/scoreboard players tag @a add fly {Inventory:[{Slot:8b,id:\\\"minecraft:bedrock\\\"}],SelectedItemSlot:8}"}},{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 replace {Command:fill ~ ~-3 ~-1 ~ ~ ~ air}},{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block},{id:MinecartCommandBlock,Command:kill @e[type=MinecartCommandBlock,r=1]}]}]}]}