Lenka,
it's easy. you'll need an air pump, a few meters of hose and an air diffuser aka a bubbler. if you want to connect several diffusers you'll also need a T-piece or something for the hose. you can get everything from an aquarium shop. also if you explain them what you have in mind they can demonstrate how to do it. the only tool you'll need is a pair of scissors. if it's possible place the diffusers to a depth of around 10cm or deeper. you'll get more agitation then.
if you have an old fish tank, i'd also consider converting it. it's easier to maintain high humidity in an enclosed environment.
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