I error on the side of caution grumpy..... I'm not going to risk a uti. It's not too hard to sterilize.
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What is the best method to keep it clean, if alcohol isn't to be used.
I like the simple approach. I pee before I splash to make sure everything is connected, works and no kinks. If that works above water, it will work underwater as well.
As for cleaning / sterilizing, etc.. We are talking about your own urine, not radioactive waste. A good rinse with water should suffice for guys.
You should do more research before typing. It's not that your urine is infected. It's that urine provides the environment for certain bacteria to proliferate. Wait till you smell your piss after you've picked up a urease producing bacteria from your pvalve.