>>3233501Tripod and / or pay attention to sources. ISO limit is really dictated by how much noise your camera produces - I don't go over 800 / 1600.
1600 with enough street lights and a steady hand, you can usually push shutter to around 1/15 or faster, which can usually get you one usable shot going handheld. If you have brighter of course go 800 ISO and try 1/30.
As much of a meme as this dude is, there are a few good ideas in this video - especially the pouring the water on the ground thing.
https://youtu.be/HPytBIKUD-k 