Tiling adhesive. Which is best? Discussion Thread

Tiling adhesive. Which is best?

Hi.
Just a quick question.
Which is best for tiling, ready mixed adhesive or powder?
I have ensuite walls to tile and within is a shower enclosure I presume you can buy a water proof adhesive.
Also, should I be buying some thing to water proof the area below the shower. If so, any suggestions. Don't wanna spend a fortune.
Ta

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