The jug
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What is available
42 containers at 950 mL and above across this use case, running to nearly two and a half gallons. F-style bottles, industrial rounds, wide mouth packers, canisters, tubs and pails.
The F-style bottle
Flat sided with an integral handle. It stacks, it does not roll and the handle fixes the pour angle, which helps directly with the continuous coherent stream requirement.
But check the handle
A handle moulded as a hollow cavity is a reservoir that rinse water reaches last. A solid grip is not. That difference is invisible on a photograph and decides whether the container can meet 99.99 percent.
The industrial round
A straight cylinder, narrow neck, usually HDPE, built for chemicals. No handle, no cavity, a simple interior and therefore an easy container to rinse. It is poured two-handed, which is the trade.
The wide mouth packer
For granular products, where the mouth has to take a scoop. The same container is easy to rinse for the same reason it is easy to scoop from.
Pails are a different business
A pail is a wholesale and commercial format. It changes the conversation from a retail product to a supply arrangement, and it brings the refillable question with it.
Weight is the design constraint
A gallon of liquid is roughly eight and a half pounds plus the container. How it is carried, tipped and stored follows from that, and a jug without a handle asks the customer to solve it.
Ask the supplier the regulation, not the category
Whether the container meets the 165.25 nonrefillable standards and whether the removal test has been run on it. That is a specific question with a specific answer.