How to automatic water plants at different life stages?

I use separate watering machines. I have several of them and each has it's own bucket for water supply. You can mix whatever nutrients you want in each bucket. Right now I am doing photos and traveling. I have to watering machines set up. One contains my main nutrient mix and the other has water and cal/mag. They dose the plants 12 hours apart. I could have gotten by with one machine but if it fails my plants die so I split the watering between two devices. If one fails at least my plants get enough water to keep them alive until I return.

I’m not advocating for this brand because I’ve never used it.. just suggesting you check it out..but there are all in one nute line ups One called “gold leaf”.. they promise a lot that frankly seems impossible but they are supposed to be all one nute seedling to harvest.. and it’s supposed to only take up the nutes it needs and not burn. Seems impossible like I said but just passin on the info. It’s expensive as hell too

Use seperate reservoirs, I was planning 4 photos, but one seed didn't pop, and reverted to using an autoflower. Now that the autoflower is flower but the photos are not, I separated the autoflower and made a DIY temp reservoir using a 5Litre bottle.

You would need at least 2 reservoirs, 2 pumps, and 2 timers. You can build a self watering system like I did (quest for the pound plant) each reservoirs can water multiple plants.

Honestly you might have to double up on reservoirs. But that means and other water pump, probably an other timer. Or just grow out all 4 and start a new 4 it’s still perpetual but you just harvest once every 4 months ish.

I’m new but I don’t think one nutrient mix is gonna be a good idea for plants that are in two completely different stages in life. Nice set up though, I like it. I’m not there yet to have an automatic irrigation system. 🤙

I am using a 20g reservoir, following coco for cannabis nite schedule, and when I went to plant my 2nd two babies I realized I would have to hand water, which I was trying to avoid.