The bigger contradiction for me isn't the cactus and warm water (although it is for you), but perhaps the cactus and the bushes you hide behind. In the dessert, it is hard to hide behind cactuses because, well, they're in the desert. Bushes have a lot of leaves and are usually pretty dense and close together.
In the store, you seemed embarassed by the clerks treatment of you when buying the cactus. However, you are empowered when you are able to hide behind the bushes and strike out at your adversaries. You are also empowered by the skateboard and the gun.
Do you often feel you are in the right in arguments? I guess this because Jesus is on your side in the dream. I'm also guessing that you are a fan of adventure stories.
