It’s actually worse than that. Starvation takes a long time to happen (~3 weeks). Lack of access to water causes death and desperation in a much shorter period of time. If water pipelines and/or pumping facilities get screwed up in any way, cities will become mad max much faster and in a much more intense fashion. In a water-starved population, people are mostly composed of water…
Personally, the game I run the most is Shadowrun. Managed to transition my DnD group to Pathfinder 2e and it’s great. Pathfinder is DnD but so much better.