Bond CSST to Water Pipe - Allowed in 2017 NEC 250.104(B)?
The gas system only needs to be bonded at one point

Bonding the black iron at the meter to a legal bonding point (anywhere on the grounding electrode system, basically, using a listed tap connector such as an ILSCO GTT-2-2 to connect the gas bond wire to the GEC, or simply by landing the gas bond wire on the intersystem bonding termination device if one is present) will suffice for bonding the entire gas system; there is no need for an extra bond point for the CSST if the system is already bonded, as per this tech bulletin.

Or in short, simply connect the bonding wire at the meter to a suitable bonding point on the electrical system (not the water system, though!), as you don't have to worry about bonding the CSST separately.