Contact the outfit that takes care of that well and ask if they could provide you with a copy of the last test results. (Municipalities usually have to go with the Big Test for lots of stuff -- bacterial and chemical contaminants -- quite expensive.)

If you think it might be contaminated with something you could treat for (usually coliform bacteria), pour a cup into a clean jar (with a clean lid) and take it in for testing yourself. A simple test like that shouldn't run much more than $10.

But if it's clean, kept cool and dark, I can't see a problem, as long as the containers are intended for water. If the containers are clean and the water is clean, bacteria isn't going to suddenly show up. With heat and light, you might get some problems.

Sue