Karen, where I am I water most of them about every two weeks during our summer weather (95+ days are the norm) and keep them under 50% shade cloth. Some can go longer without water than others and some are thirstier, I have to pay attention as some will start to wrinkle and wither while others will look perfectly fine. 'Emerald Empress' and 'Pinkerine' are two that demand more summer water than any of my other sempervivums. I always water at dusk when the evening winds come up and the temperature has cooled off.
With sun you can experiment and see if any of them have a higher tolerance for sunlight than others too. My 'Pink Lemonade' was in a sunnier spot than any of my other sempervivums and not only looked great all summer but even started leaning a bit towards the sunlight, and according to Mountain Crest Gardens it doesn't like sun as much as other ones do
'Hart 8' is another one that is sun hungry here.