Ms Jenkins said there were safety measures in place including the water being poured over shoulders, not the head, and participants drinking a non-alcoholic drink afterwards.
"We don't support the consumption of alcohol. That's not what we are there for."
Ms Jenkins admitted she wasn't hugely impressed when she was nominated, but decided to organise a mass ice challenge at Lava Bar on Sunday night. "I didn't want to do it but thought if I'm going to do it, let's do it with a bang."
She and fellow workmate Trish Cantwell from Red Cherry Ink are both planning to take part on Sunday - and they've been walking the streets drumming up support from other Rotorua businesses to get involved too.
"We're trying to get as many local businesses as we can to do it with us." Ms Jenkins said it was a fun way to get behind a good cause, with money raised going towards a charity of choice, mainly charities associated with cancer.
She said she had family members and friends who had been through cancer, so the cause touched close to home.
Head along to the Lava Bar on Sunday for the 6pm event.