Wet feet? Who me? :o :D
And if you're not paying attention and already have the tip out setup near your shoulder, it is possible to jump back, hit the faucet and never drop your water hose, which is apparently more important than protecting your shoulder ;)
At one time I used to think it was smart (???) to do the tip outs, then crawl under it to hook up the water line. Forest for the trees...
For the calcium or deposits...
Your hot water tank likely has a drain plug. If so, use it when filled and without any pressure so it drains slowly, then add water to stir it up again and repeat. You may have to stick a small piece of plastic (ie end of zip tie, NOT metal!) into the drain if it clogs with sediment.
If it is REALLY bad, and you are careful, you should be able to attach a host to your TP (relief) valve and slowly add water with the inside water line valves closed and let it flush out the drain valve.
Make sure to open the relief valve and although the pressure is fine, don't allow too much water volume at once, which can be hard on the little "stick" inside the relief valve.