To phase 3. Motorized transportation took 60. Planes took about 30. Space travel only just reached phase 2. Electricity is entering phase 3 with renewables. Water supply is still firmly in phase one. You can't rush the process. You can't accelerate it. How long it takes depends on the complexity of the technology and advances in the physical sciences. Not on economics.

Maybe one day water will reach phase two and 3. But considering it has not moved past phase one in over 8000 years (first irrigation systems) that is not something we can bet on happening in our lifetime let alone in time to avert this problem.

Ps. Companies with big government contracts are never any more efficient, cheap or well run than government departments were. Phase 2 only cuts costs when the corporations improve the tech without contracts and then compete to sell it to governments. Why would government buy it unless it's cheaper than what they were building themselves?