A DexCom continuous glucose monitor is wireless and waterproof. Insulet Omnipod is a wireless and waterproof insulin pump often used together with a CGM in active individuals.
Regardless of what insulin pump and CGM or even fully looped system you choose, they are electromechanical hydraulic devices and can fail, leak, or be torn off in an instant. These devices are tasked with managing liquids in quantities often smaller than a tenth of a droplet.
Most insulin pumps carry at least a couple of days insulin in them when everything is working as it should.
Carrying an extra meter, lancets, lancet device, test strips, alcohol swabs, manual insulin syringes, and a vial of insulin in a waterproof anywhere go pack is always a good idea for when the shit hits the fan.
Ideally, the extra vial of insulin should be kept in a waterproof container in the drink cooler if one is available.
Many kinds of insulin are stable at room temp for up to 30 days, but insulin is a protein that looses its shape, effectiveness, aka is destroyed below freezing and above body temperature.
Think of what happens to an egg after you fry it, or how disgusting an egg could taste after it is frozen.