I use the one gallon containers we get our orange juice in. They are plastic and the plastic is very sturdy or thick compared to a typical one gallon milk jug. Nice and strong.

First I pour out about a cup or two of water and place it into a watering can. This allows for enough air space within the container to shake it thoroughly and allow the nutrients to mix up nicely. I also believe that it also oxygenates the solution when you really shake it up prior to feeding your plants.
I add each nutrient and then shake the container aggressively for about 30 seconds.
I then top it off with the clean water I first poured out.
After this I shake it up again for just a few seconds and pour out a small sample to check the ph.
After checking the ph, if an adjustment is needed and there is something added to the solution such as ph up or ph down, I again shake it aggressively for about 30 seconds and then check the ph again.
Repeat until desired ph is achieved and the shake the tar out of it one last time right before feeding.

:thumbsup: