Brewing does not require Blaze Powder (unlike vanilla 1.8).There are some notable differences to how brewing works in SkyBlock, such as: However, unlike vanilla Minecraft, Glowstone and Redstone can be stacked on each other (but only one of each kind)
Potion brewing is similar to vanilla brewing, with Nether Wart turning water bottles to awkward potions, Glowstone Dust increasing its potency, and Redstone increasing its length. A Brewing Stand is required to make potions, which can be bought from the Alchemist for 30 coins each, or crafted with 3x Cobblestone and 1x Blaze Rod.