It may be that the particular chemicals used do not react with copper, but do react with steel. Or, the copper pipes may be slated to be painted or covered later. The inspector may not be aware of the corrosive qualities, but the designing engineer should.
The code (250.104(A)(1)) requires water piping SYSTEMS to be bonded to the grounding electrode system, either to the GEC, to the service neutral bus or to a grounding electrode used (such as building steel)
If you have isolated sections of water pipe, you may not have to bond all of them together. This call, as to when an isolated pipe becomes long enough to be considered a system, lies with the AHJ. To be safe bond them all together, and to the grounding system.
Like Paul said, make your connections permanent and use approved fittings designed for the purpose and conditions of use.