Are they plastic or glass or like a paper milk carton? I can't picture what you're talking about...Love trying to figure this stuff out, though!
I use to use the coffee creamer containers to package my homemade milk bath salts in. You could also use the container to spread seeds just tape the pouring hole smaller.
Parmesan cheese containers I use whenever I need to sprinkle something like seeds or salt on the front steps. Tape over the holes in the lid for greater control. I also keep on filled in the car for sprinkling ice melt on the windshield.
They are just plastic bottles I think the brand I use is called Coffee Mate or something like that.
@ pelenaka- Good idea about the pamesan cheese containers!
I was thinking about cutting off the bottom and putting them in the ground next to some plants to the water would go deeper into the ground.