You don't need to feed dry and wet.
In fact it's healthier to just give them wet.
Dry food usually has a lot of fillers and it's so dry it can hurt their kidneys.
What size are your cans?
Mine are 2.9 oz and they're barely enough for one cat for one meal.
I need 10 cans per day at that rate.
I can't find bigger cans but I wish I could, so they could share.
It would likely be cheaper (I have five cats.)
*Also yes, if it's open you need to refrigerate it.
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And in the end, the love you take is equal to the love you make.