Environmentalist Wayan Suardana, from the Indonesian environment forum known as Walhi, is leading the charge against the BIP.
He says building more conference facilities makes no sense when the island already has enough.
Suardana says the amount of water the BIP will consume is staggering, at about 669,000 litres a day; that's equivalent to the needs of approximately 4,500 residents in south Kuta.
He says the island is already struggling to meet current demand.
"Symptoms of the water crisis are now seen more often with a lot of areas experiencing drought."
And, he says the site slated for the BIP project has been used to grow crops like rice, taro and corn so if it goes ahead, farmers will be shoved off the land and lose their income.
"The impact on farmers is quite large considering they could no longer farm nor have they been provided with other land to farm or any other alternative after eviction," he said.