@freedom4all - Hey!
I'm a coco hand waterer, and while it probably (almost definately) isn't as close to a hydro experience as using drip feeds multiple times a day, it is a good easy method and definately works.
As far as keeping it cheap goes, i would not recommend using non specific coco nutes (I know you "can" and others "have", but why add a layer of complication?)
I recommend for ease (if possible) Canna Coco A&B (they're £9 each), some Rhizotonic (quite cheap again) and a bloom booster - Now Canna Boost is pricey ... but it definately makes a difference and having tried with and without Boost.. i'd buy it every time.
As for the coco - i would only really want to use Canna Coco Professional - its really clean and buffered straight from the bag - Again it's another step that i consider reliable and chosen to keep complications away.
Get some PH down .. becuase if you want to keep it really easy, just aim for 5.8 every time and you'll get to a harvest.
An EC meter is quite important with coco as you'll want to be knowing the strength of your feed.
I find most people new to coco (including myself) struggle with the starts. It's important not to water below an EC of 0.8 .. and i usually aim for 1.0 as i don't think the extra 0.2ec will burn a seedling. - Now the struggle here is that you don't really want to water a 10 litre(+) pot full of water with a seedling in - you want to build up the waterings .... to make the roots search for the water.
BUT .. you do want to be mindfull of the feed you're putting in will by taken up and that not used will be drying and causing a salt buildup from the little nutrients you put in.
I want to get to watering to run off as quickly as possible - but not at the expense of the roots not searching and consequently a smaller root system.
So i'll wait for heads up - then give 200ml of water(with cocoA&B and rhizotonic) at 1.0ec and 5.8ph. circling round the stem.
Next watering 2-3 days later at the same strenght and ph but 400ml round the outside of the pot.
Next watering 2-3 days later with the same strength but 600ml round the stem.
Basically I want encourage the roots to search - and want to quickly get to the point where i can water to run off (which in a ten litre pot is about 2-3 litres depending on how much is left in there)
You don't want to let your coco completely dry - Lifting the pots when fully wet shows how heavy it is, and then at about 30% of the weight you can water again - like a wet and dry cycle (but wet and "almost dry")
I would hope the plant (and root system) is established enough to be watering to run off every time from 4 weeks. I would probably be watering every 2-3 dys, but checking the pot weight.
I would UP the EC at stages - you could go up by .1 at a time if you like fiddling, but personally, i go 1.0 for seedlings, 1.3 when they've got some sets of leaves, try 1.5 at about 5 weeks, at 7 weeks 1.8
My autos mostly go for 80 days. I would stop uppling the EC if i saw leaf tips burning (going yellow to brown) and back down a little.
In late flowering, it wouldn't be surprizing to have to feed them 2 litres a day each if they are really sucking up the feed.
I've used this simple guide once with a new grower (completely new!) and they had a lovely harvest. He's on a start too so hopefully i can confirm that this method will easily get you buds in 80 days (but i'm pretty sure it will)
Hope this helps!
Blue