In veg with new soil. I start in a solo cup, and feed only tap water. 2 weeks later I transplant into new soil, and continue with water only for about 2 weeks before I introduce nutrients. I start with what’s recommended because the plants are already established by this time. Some strains may not like it, so I would recommend starting nutrients half strength if using bottles. Go with what’s recommended on any organics. Most of that needs time to break down so you don’t want to skimp out. Reading the plants is key when it comes to watering.
It’s hard to schedule watering, it’s best to wait til the pots are 80-90% dry using soil. Lifting the pot will help gauge when to water.
Bottled nutes I would go every other watering with a feed. Calmag/epsom/silica supplements on the off days.