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the only way back is the Cauldron (last step).
Tested 26.3
Block
Cauldron block in Minecraft
The Cauldron is a cauldron, an iron basin that holds water, lava or powder snow. This is the empty one, the only cauldron that exists as an item.
It is made with the Crafting Table from 7 × Iron Ingot. It is mined with a pickaxe.
What it does
Seven iron ingots make an empty cauldron. Pour a bucket of water, lava or powder snow into it and it fills up; take it back out with an empty bucket. A water or powder snow cauldron holds three levels, and a glass bottle takes water out one level at a time.
Cauldrons also fill on their own: rain and snowfall slowly add water and powder snow, and pointed dripstone hanging above a cauldron drips water or lava into it from the block above. A water cauldron puts out burning mobs, washes the dye off leather armor and the top layer off a banner, and removes the color of a shulker box.
A cauldron is the job site of the leatherworker, and a Redstone Comparator reads its fill level. Breaking any filled cauldron gives back only the empty cauldron.
How to craft
Crafting table 
7 × Iron Ingot → Cauldron
// Slots with several items cycle through every accepted option.
How Cauldron connects
6 links · from the 26.3 game dataIn structures
Same family · tag #cauldrons
Water CauldronLava CauldronPowder Snow CauldronTutorials with Cauldron (3)
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A leatherworker works at any cauldron, empty or filled.
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Right-click a water source or a filled Cauldron with them, then put up to 3 Water Bottles in the bottom slots.
Tested 26.3
Obtained from
Tags
#minecraft:blocks_dolphin_jump#minecraft:blocks_fluid_flow#minecraft:blocks_lava_fire_spread#minecraft:blocks_motion#minecraft:blocks_motion_in_heightmap#minecraft:blocks_motion_in_heightmap_no_leaves#minecraft:blocks_motion_no_leaves#minecraft:cauldrons#minecraft:causes_suffocation#minecraft:cushion_uses_collision_shape#minecraft:entities_can_teleport_to#minecraft:ice_melts_when_destroyed_above#minecraft:mineable/pickaxe
Cauldron · FAQ
How do you get Cauldron in Minecraft?
At the Crafting Table: 7 × Iron Ingot give 1 × Cauldron. Mining the block drops it.
What is Cauldron used for in Minecraft?
It stores water, lava or powder snow, collects rain and drips, and washes dyed items.
What tool do you need to mine Cauldron?
The fastest tool is the pickaxe.