Riddle Time V1

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[b]Try to figure out and answer the most riddles you can, they just require the cool application of logic to solve...

I'll start us off[/b]

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[b][i]Warmup[/b][/i]
[b][u]The Container Problem[/b][/u]

You have two containers, one of which will hold three gallons of water, the other five gallons of water. You need exactly four gallons of water.

How do you use these two containers to measure out the four gallons?

YOU CAN RE-FILL AND EMPTY CONTAINERS!
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[b][i]Insane[/b][/i]
[b][u]Who owns the fish?[/b][/u]

There are five houses painted fix different colours. A person with a different nationality lives in each house. The five house owners each drink a certain type of beverage, play a certain sport and keep a certain pet. No owners have the same pet, play the same sport, or drink the same beverage.

The facts:
1. The Briton lives in the red house.
2. The Swede keeps dogs as pets.
3. The Dane drinks tea.
4. The green house is on the left of the white house.
5. The owner of the green house drinks coffee.
6. The person who plays football rears birds.
7. The owner of the yellow house plays baseball
8. The man living in the center house drinks milk.
9. The Norwegian lives in the first house.
10. The man who plays volleyball lives next to the one who keeps cats.
11. The man who keeps the horse lives next to the man who plays baseball.
12. The owner who plays tennis drinks beer.
13. The German plays hockey.
14. The Norwegian lives next to the blue house.
15. The man who plays volleyball has a neighbor who drinks water.

Who owns the fish?
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Feel free to contribute, try to use...
Level of difficulty:
Title:
Facts (if there are any):
Question:
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first one. Use the 5 gallons twice, then take away twice with the 3 gallon.