You mean a bin?
How big is it? 15 gallons seems a minimum for two gerbils.
I would really need a photo.
I cut the top off a Sterilite bin (leaving several inches around the edges of the lid). I used a strong pocket knife that had a saw edge, and I sawed the rest off.
I made no holes in the sides; the waterbottles hang over the edge. If that does not work a tiny hole for the wire of a Quick Quench bottle can easily be poked through with the sharp end of a knife - just twist and turn.
The tricky part is securing screen mesh to the remainder (those edges) of the top (the lid). The gerbils must get plenty of air, and most of what was the top has to be now screen for air.
I think the BEST way to secure the mesh screen is to poke a bunch of tiny holes in the lid edge, and then use those wire bag ties to secure it tight, lest the gerbs escape.
It works for me.
If the plastic is too thick for you, heat a small nail (holding it with pliers) over a stove and melt the holes.