The water ones are "usually" made from difference material compositions to help with the absorption and release of chemicals & "tastes"......like getting a hose for drinking water, for same reasons.
I'm one of the WM water jug people
Used them in winter to tote hot water (have the heated units, 3 yrs now!) and to take home water to shows, etc.
I have the ldry detergent spigoted ones & hated to toss as it just seems they have a use
but, out they go! BUT, I have had powdered detergent come in containters with lids, handles, all plastic and I find them great to carry things.......jars of ointments, wraps, bruses, etc. Washed out they are nice for "free" organizational containers. Same with the large size, large mouthed plastic clear food containers. You can drop small bottles of pills, syringes, tape, thermometer, etc. into them and keep them in the barn.