Toilet water has at least 2 very different meanings. Eau de Toilette (toilet water) is a perfume. It may be held in a perfume bottle or atomizer (sprayer). Water that is flushed from an actual toilet may be held in a septic tank or a cesspool.
The name for a lavatory water container is a toilet tank. It is a reservoir that holds the water needed for flushing the toilet.
Toilet tank
flask
A picnic hamper.
That could be a gas tank or a gas can...
Dewar flask
A container that holds more than 1 liter is commonly referred to as a "jug" or "pitcher." These containers are designed for storing and pouring liquids, such as water or beverages. Other examples include large bottles, tanks, or canisters, depending on the specific use and shape.
folder, envelope, box, briefcase, filing cabinet, a safe, ...
water closet
a bottle
A bidet is a toilet that sprays water for cleansing.
It's an old fashioned obsolete name for a toilet or lavatory.