It’s a little pricey for a step stool, but we got this when my oldest was a year and we still use it now that she’s three:

Toddler Kitchen Stool - Gray Wooden Step Stool Standing Tower for Kids Kitchen Counter Learning https://www.amazon.com/dp/B09PRTRVZT/ref=cm_sw_r_cp_api_i_51YXD4F1T1N9EY5FPDZ7

Also agree that you should get a faucet extender. You may actually find that you don’t need a taller than typical step stool if you get a faucet extender. Good luck!