Worstgen
Finalbeta
You will need supporting ships for that :P
Buusatan94
And even this would take a lot of time and ressources since Wano has no trade deal with exterior countries yet due to Wano being still cut from the rest of the world. Only trade with or massive deliveries from the country of food Totto Land could allow Wano citizens to finally fully eat shortly after Wano arc end.
Finalbeta
Exactly that is the focal problem
RiShin
Or a purifier Df of some sort that can purify the water and I'm sure there will be enough food in Kaido castle to last the wano citizens until stable food comes it way.
Yo Tan Wa
How bout Zou arriving to Wano?