A Rocha's speaking after developers came top in the UK round of a European Union sustainability award for creating a water bottle you can eat made mostly out of seaweed.
The packaging, called Ooho, is tasteless, hygienic, and totally breaks down. It's been marketed as "water you can eat" by its designer Pierre Paslier.
According to A Rocha, billions of tonnes of plastic are dumped into the sea every year, which causes extreme damage to ocean wildlife and water quality.
Floating in the Pacific Ocean is a huge island of rubbish called the Great Pacific Rubbish Patch. It's bigger than the US state of Texas in area, and is made mostly of plastic bottles.
The charity also says it takes 2000 times more energy to make a plastic bottle of water than it does to fill an old bottle with drinkable tap water.
Andy Lester, from A Rocha, told Premier: "Boycott water bottles... Look for alternatives. There are one or two companies that produce water bottles from entirely sustainable sources and where the water source is sustainable too.
"I would love us as a faith community to say no to water bottles. There is no need to drink water from water bottles in the developed world.
"We can have our own bottles, we can fill them from the tap at home... It's just sheer laziness, and it's time the church took a lead on it."
Listen to Premier's Aaron James speaking to Andy Lester here:
