Sift the dry ingredients into a bowl to remove any lumps and ensure even mixing.
Gradually add water while stirring, whisking until a smooth, lump-free batter forms.
Dip fish or chicken filets into the batter, coating them entirely to create an even layer.
Heat the oil to 350°F, warm enough to fry the fish until the batter turns crisp and golden.
Carefully lower the coated pieces into the hot oil without overcrowding the fryer, and fry them until the exterior turns a rich golden brown and the fish is cooked through.
Remove from the oil using tongs and transfer to a paper towel-lined plate to drain excess oil before serving hot.
Serve hot and enjoy.