Families in Tuvalu's capital, Funafuti, are being allowed only two buckets of water a day as the drought continues.
The government estimates the country has five days of drinking water left.
Tuvalu is bringing in more fresh water on ships.
Andrew McKie from Red Cross New Zealand said two portable desalination plants have also been brought in to help alleviate the water shortage.
"They were transported to an island right in the south of Tuvalu, Nookilaulau, which although it's a small island was one of the ones worst affected by the drought," he said.