Gather Materials
You'll need glow ink sacs and sticks. Glow ink sacs drop from glowing squids found in deep ocean biomes and underground water caves. Sticks are easily obtained by breaking leaves or crafting them from planks.
Arrange the Crafting Recipe
Open your crafting table. Place a glow ink sac in the center slot, then position sticks above and below it (vertically aligned). This creates a 
Glow Ink Torch. You can craft multiple torches at once by repeating this pattern across your crafting grid.
Collect Your Torches
Drag the completed torches into your inventory. Each successful recipe yields one torch. Store extras in a chest for future underwater projects or deep cave exploration.