The International Organisation for Migration says it is working to install reverse osmosis machines on islands hit by typhoon Maysak last week to restore a stable drinking water supply.
The category five supertyphoon swept though Yap and Chuuk states last week, killing five people, destroying homes and crops and contaminating water supplies.
The IOM's chief of mission in FSM, Stuart Simpson, says there is a desperate need in the worst-hit areas for food, shelter and drinkable water.
"Priorities at the moment are actually water, not only for drinking but obviously for hygiene. IOM is actually setting up reverse osmosis machines to provide a stable source of water on the islands, that way the water can actually be produced there without having the need for actually shipping."
Stuart Simpson says aid distribution is well underway, but the sparse nature of the Federated States of Micronesia means it is a significant logistical challenge.
Damage caused by Typhoon Maysak in Ulithi, Yap, Federated States of Micronesia Photo: Brad Holland / FSM Office of Environment and Emergency Management