Serious dehydration will turn everyone of us into a zombie (behaviorally) . You crawl, you walk, you fall, you just don't care. The only word you know is WATER. You need it the most like how zombie need your flesh. Instead of zombie which their vocabulary limited to 'ughhhhh' and 'arghhhh'. Yours is understandable the least. And unlike zombie, you'll feel the pain when some one cut off your limbs. So here another situation where again, you just bought a container for your kid but someone put a spell on you, you get lost. Ironically you didn't have a single sip of water. You are thirsty. Having to drink your own pee is.. a nightmare. Fresh water source is nowhere. Then you ask, "How can i get some clean water to drink?". Don't worry. Here are the techniques.

Luckily you have a container and a transparent plastic bag (from the shop). Another tool you need is, digging tools, straw and rock. Look at your condition now, we need to improvise. for digging tools you can use some twig, flat rocks. Straw can be made of leaves. Rock can be replace by any heavy thing. Container. your shoes could help especially if it's leather. Or make it out from leaves. Here is the blueprint. Go find moist areas with consistent sun shine then start your construction. 

In case you are too lazy to dig a hole, or just afraid your polish nail broken. Then grab that plastic bag, Take away your shoe laces or any vines nearby. We need it. Now go find some nice reachable leafy green tree branch or shrub. Choose which one that look tasty because what ever water that transpire, the taste will be theirs alike. And don't wrap up on poisonous one. Even you want to kill yourself, that's look stupid (even suicide is already stupid). Here is the blueprint. 

With 1st and 2nd method, you now inching to the beach. go ahead and dive in. But never ever try to drink that water. The risk of death was 39% for those who drank seawater, compared to only 3% for those who did not drink seawater. Bare it in your mind. Dire need for water? Step back about 100 feet from water line. Turn your desperation into digging sensation. Dig a 3-5ft deep hole.  Strengthen it wall and base. Wait for a couple of hours. Then you'll a filtered water. If it's too salty. Dig a bit further inland. Here is the blueprint. By the way, it'll works near any body of water. For inland, dig up closer to the water. In the desert, dig at low point and close to vegetation. Look for moist soil as it is the hint for groundwater. 

Now you got water, please purify the water before drinking it. If you do really get lost, try different method simultaneously. It give you upper hand in stocking up your water. More water collection mean better chance of survival.