Desalinization is much more expensive and only available to areas bordering large bodies of natural water. More R&D needs to be done with
Atmospheric water generators that can extract water vapor from air into drinkable water. Consumer models are available for $1-2k. With larger economies of scale, the prices would drop enough for them to be affordable for most non-3rd world households. However, someone needs to design industrial sized machines capable of generating enough water for agriculture and irrigation.