What should I do with my plants while I am on a holiday?

I have an aloe vera, some ivy (Hedera), some "money tree" (Crassula ovata) and some other plants in my appartment. I will be on a holiday more than one month and I do not know what I should do with my plants. Should I place all of them in lots of water? Should I place them in darker corners of the house? What should I do so that they do not die until I come back, because there is nobody that can take care of them.
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