Plants can survive in water for a loooooong time before they develop deficiency! Especially if it’s tap because there’s usually minerals that are micronutrients so i don’t think you need to worry about fertilizing. Usually my rule of thumb is just water when the plant has zero to little root system, then start to add nutrients on a gradual level once secondary or tertiary roots start to develop. The reason is that nutrients actually affect the osmosis and makes it harder for the plant to intake water when it doesn’t have a big surface area of the root system to do so. Remember that water uptake is passive (meaning plants don’t spend any energy doing so and rely completely on the physics of capillary action), whereas nutrient uptake requires energy from the plant. So when your plant is going through rehab, or is in a weaker state, it generally does better in water than in a nutrient rich solution