With me I switch it up a bit..I use DVP Natural Balance, Chicken Soup for the Cat Lovers Soul, Wellness..And I switch the flavours also.
With my two cats only one gets the canned...My other has had a sensitive tummy since he was 12 weeks old, he is 6 now..And trust me, he has gone through every test, xray and ultrasound..He just can't stomache it.He will throw up every time. He is very healthy otherwise. So he has the dry(free fed) and drinks very well.
I too do shift work and work long hours..I can be gone for up to 15 hours depending on the schedual..And knowing the dry is down is knowing my cats won't starve..