@GreenGrowtheRushesOoooh I would say have a go by practising in the privacy of your own shower to see how much noise/whoosh is involved by "letting . yourself go" and see how you can regulate that.
Try drinking a pint of water (568ml) first then top up with another half pint.
Looks like 700-750 ml is the typical volume of a wee.
Then drink another half pint of water and wait to go.
I think the Tena and period pants would muffle the sound of a controlled pee with a layer of clothing on top.
But doing an uncontrolled "horse piss" is likely to attract attention IYSWIM!
😂