Have you thought about the larger watering cans with the removable end or even smaller plastic petrol canisters?

I use a reservoir so basically half fill it with water then i disconnect the pump from the pots (its basically just circulating around the res) and add half my nutrients (Canna Part A), fill some more water and then put the rest in with Part B). I leave the water to circulate for a little while and check the PH and adjust as necessary. Once i get it where i want i connect the setup back up and off she goes!!

:thumbsup: