before things get crazy around here, let me say that i KNOW mason jars are glass. i KNOW that if dropped the jar will likely break. i KNOW that a preschooler could get cut on broken glass. so, use at your own risk. BUT when my kids were preschoolers they drank out of glass all the time. we’ve used small mason jars for years. but i never did this. and i can’t believe it. i would have in a second. i drilled a hole in the lid, pressed down the sharp edges, pushed a strong plastic straw from our camelback water bottles and YES! no spill!
though i missed my chance for little ones, it turns out 13, 9 and 6 isn’t too old for the benefits of a spill proof mason jar. especially with blue kool aid. especially in our basement with a carpet that is already struggling.
they loved them.
newcreationpreschool.com 
Excellent idea! You can actually buy plastic mason jars, too, but…. they come with a different style lid: http://www.amazon.com/PAK-Strengthened-HercuGlass-strongest-Guaranteed/dp/B0045I9RB6
me like this ;D
Hey for people who don’t want to use them with kids – adults can use them on the patio to keep bugs out of their drink in summer time.
You are a genius.
A drill! Great idea. I tried to use a hole punch on the lid because that is how I saw it done. Can’t wait to get some mason jar cups ready to go for us! Thanks!