Drinking alot of water,is it good or bad?

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We all hear that we should drink 8 glasses of water a day.You have to admit thats alot of water.But what is the main reason behind it? I used to drink cola all the time and when i say all i mean ALL.It was the only thing i drank. I finally decided to get rid of it all together and start on water.I figured a can of pop had 160 calories and water NIL.Because I found it gross I decided to buy the individual packs of kool aid.Your probably saying why not the (crystal light) packs in stead? I cant stand the taste of aspirtame (i know that cant be spelt right)..... Anyways...im finding by the end of the day I feel ill.How can pop survive in my guts better then water.So I am wondering how good can it really be for you?Any opinions?