Should I drip?

We recently got donated a little greenhouse ( about 8 x 6 ) and I was wondering about the best way to water it

I've got a few options :

1) by hand ... I'm there 6 afternoons out of seven, so it's not really a problem
2) a misting system ... although it mists from below ( ie/ ground level ) I'm not sure it's best for the plants.
3) a drip system ... I think this is the best option?

At the moment we've only got a few tomatoes and cucumbers in it, growing in grow bags, but we've more waiting to go in as soon as they've got a little bigger, and I'd like to get everything ready before it's needed.

A couple of details :
The greenhouse is in the far corner of a field and doesn't have any electricity or running water etc, but I'm only a hosepipes length away from a supply .... I could also ( at a stretch ) get an eleccy supply there as well.

Sometime this week I'll be getting at least one huge blue barrel donated, so I was thinking of using that to supply any water needs, topping it up with the hosepipe if required. From looking at "big drippa" type of systems I assume this will have enough preassure to run a drip system, but probably not enough to power a misting system ( although I can get a pond pump of whatever size was needed to run it )

No matter which method I go for it'll pretty much cost me nothing as we either have all the parts or can adapt available stuff to do the job enough.

Personally I'm leaning towards a drip system as, from what I've read, this would give the fruit and veg a more consistent environment, but what do I know, I'm just a beginner

Any advice/views would be appreciated.

¥

watering can is bast
driping causes shallow roots and a constent damp surface which encoreges fungus
misting is great for mildew you will get it every were