Aloha Iam2,
It's pretty cold down here too.
You'll find different martial arts that will have the practitioner sit in snow or under a cold mountain waterfall to test of among other things, the ability to focus, control, develop and protect their qi.
I have a personal connection piece I do with the special bodies of water I visit, whether that is in Kauai, Aruba, a private pristine pond in Ottawa(yes, I make it up to the Great White North occasionally), or even the Baptism river that flows into Lake Superior during a Level 4 retreat. It is not a deep meditation, as I have asked Chunyi about this due to my water connection.
"Do not do deep meditation in water....that is maybe in level 22", he says with a smile.
I'll let you know what's up once we have that level 22 retreat 
Meanwhile enjoy the relaxation and wieghtlessness of your pool experience,
Much Love, Shawn
