Still new here, but I'll give it a shot. Typical household water lines have somewhere around 40psi, maybe a little bit more, which will crank out just under 40 gallons per minute on a 1-inch pipe. A half-inch pipe? I really don't know.
A drip system shouldn't require much psi, but you probably want to make sure you irrigate from a point closest to your water main, and you might get just above 50psi depending on where you live. The closer you are to the city or municipality's water main, the more pressure you'll get. --- I don't know how many rows you're irrigating, and if it'll affect your water pressure if you irrigate all of your rows at the same time. There's really where the math comes in.
All you need to calculate is the GPM for your drip nozzles and how many GPD your plants will require. You want to make sure that the plants gets their GPD requirements within a given time window, whatever that window may be. Same concept as a home sprinkler system. Especially if you plan on avoiding watering during the heat of the day. Losing water to evaporation is a waste.
How elaborate do you want to make the system? If it were me I would go with a sprinkler system that can get the job done fast, in which case you may need a manifold and a controller since sprinkler nozzles will definitely require more pressure. I'd just worry that a true DRIP system wouldn't get a fruiting plant the water it needed in a reasonable amount of time. If you're trying to water a fruiting vine that needs 20-30 gallons per day I just don't think a DRIP system is reasonable or will get the job done in 24 hours. With our home sprinkler system, trying to run the front yard & back yard sprinklers at the same time will suck all of the pressure out of the lines and the sprinklers won't work because there isn't enough pressure. Irrigation systems will have this same problem.
With a controller and manifold system you can set it up to irrigate one row at a time in a sequence. Say it takes 15 minutes for each plant in the row to get their GDP requirement ; then the controller turns off the valve and opens up the next valve, runs it 15 minutes, etc. They're easy to set up. Controllers might cost you $100 for something cheap. --- I would focus on getting 1 row at a time watered and use a controller. Then you really don't have to worry about doing all of the math.
https://www.plumbersstock.com/manif...MIlJa774Sm1QIVjG5-Ch3uYQ-IEAQYBCABEgILqvD_BwE
https://www.plumbersstock.com/manif...MIlJa774Sm1QIVjG5-Ch3uYQ-IEAQYBCABEgILqvD_BwE