Answer
The equation is already balanced
Procedure
The equation provided
SICI (s) + H₂O(l)→ HSIO (aq) + HCl(aq)
Contains 2 hydrogens, 1 Sulfur, 1 Iodine, and 1 oxygen atom on the side of the reagent, the same amount is seen on the product's side, therefore the equation is already balanced.