We have a automatic litter. A automatic feeder, that distributes up to 4 meals of dry food a day, holds enough food for 10 days. Water is a fountain with filtration system, that will hold enough for 10 days. We have cameras that she can activate, and we can see her and talk to her.
That said, we have a true cat that can go days without acknowledging you even exist, before she finally wants little to some attention. But 2 days is all she will tolerate being alone even if she has ignored you for 5 days.
If your cat requires wet food, there are excellent auto feeders, with sectioned meals, that has ability to keep food cold for 5 days. OP there is a cat crazy club you might contact, that has people who will help with your cat.
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Do not worry about things you can not change 
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