I bought a hose that fits over the spout of my watering can. That way you just hold the hose in one hand and the can in the other and water away. My screen is smaller though, 2x2. I like to keep the screen about 6-8" above the soil. That leaves me enough space to work below the screen and I can start training them early while they're easy to bend. You will have to try out what works for you.
Looks like you have a nice setup, good luck with the grow!