Put white chocolate in a heatproof bowl that fits inside the Instant Pot insert. Put the milk chocolate in a separate heatproof bowl that also fits in the Instant Pot insert.
Add 1 cup of water into Instant Pot insert, select the sauté button, and set to less heat. Stir periodically until white chocolate is fully melted. Remove the bowl.
One at a time, dip the strawberries into white chocolate, then place on a baking tray to set. Add about another half cup of water to your Instant Pot.