3 gallons a second is not enough to power a small stream or creek. It’s roughly ‘rivulet’ or ‘wet spot’ territory, and only roughly 10x garden hose flow rates at typical household water pressures.
I’m honestly shocked they could run a commercial bottling operation off that. That’s only 180 gpm, or .4 cubic ft/s.
A typical 5000 gallon commercial water carrier truck is going to take about 30 minutes to fill off that, and that isn’t much water by natural standards.
For instance a 100 ft diameter pond, 3 ft deep (quite small) holds 176,256 gallons, and due to soil absorption and evaporation might never fill up from that source. Even if plastic lined and in a non-desert environment (this one isn’t) that’s over 40 hrs at full flow rate to fill it.