When I opened the big bag of horticultural corn meal I found out that there's a bunch of weevils in there. Are they a problem for making cornmeal juice to use as a soil drench?

Well, you will probably drown the bugs but that is the lesser of weevils.
<ducking>

Humor!

No, the weevils aren't a problem for you making corn meal juice.
If you want to kill them, leave them outside the next few nights so they can freeze or put the bagin your freezer to accomplish the same thing.

No harm, no foul.
Kathe

Weevils

The way I kill the "evils" is the old fashion shoe swapper.
As for larvas (I call them "white snots", because that is what they look like), I either flush 'em down toilet or feeding them to ants(which is more fun,he-he!).

I have tossed the adults on ant beds, but ants could not bite through the hard shell,so adults could walk out of there w/o a problem. So I crunch weevils with shoe, and then toss them unto the ant beds so they can have some credit .

Tree Dude

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I always tell people to only get enough organic fertilizer to last through the growing season. When you try to overwinter it, it ends up buggy in the spring. Now, I still use it in the buggy condition but it's a little gross. The bugs also provide protein and microbes to the soil.