ohh ok ya i wasnt sure if could leave it for next feeding thought had to use it all each feeding\watering, how many days it can last with nutes in the water ?
Because everything is mixed and will eventually precipitate, 10 days was the max for me in my tanks, stirring at least once a day. Because you've got a very small, single operation, I'd just mix up four gallons, and stir it each time you water.
If you notice solids at the bottom of the pail, it has sat too long. Before you know it, the plants will be drinking by the gallon.