Can you survive off of insects and dirty water
this is a very scientific question
For a while. The dirty water is likely to make you ill (it can sometimes kill you), and the insects are probably not nutritionally complete.
Not for long
No. The only single food/drink you can survive on is breast milk.
Yes, if you know how to use evaporation to distill the water first, or can filter and then boil the water for a few minutes first....and if you know what sort of insects you can eat safely. Even The Bible recommends locusts.