I just love this song, i would love to hear a studio version...anyway, this chords 
and riffs are 99.99% accurate...the rhythm is up to you...
The song is a piece of cake

Chords used:
   
     EA DG Be            EA DG BE
Bm- (x24432@1)x x x 7 7 7     or     x 2 4 4 3 2
A (x02220@1)- x x x 6 5 5     or     x 0 2 2 2 0

Riff:

e||-------10-----------9---------||
B||------------------------------||
G||---/11----11----/9------9-----||
D||------------------------------||
A||------------------------------||
E||------------------------------||

Intro: (Bm, A, Bm, Riff)x2

Bm (x24432@1)Woke up in the morning today,
A (x02220@1)What did i see?
Bm (x24432@1)I saw a bottle saying:
Riff 
 "come and drink me!"
Bm (x24432@1)So i think i drank it... 
A (x02220@1)(oh yeah!)
Bm , Riff

Bm (x24432@1)Woke up in the morning today,
A (x02220@1)What did i see?
Bm (x24432@1)I saw some weed saying:
Riff
 "come and smoke me!"
Bm (x24432@1)                        A (x02220@1)So i think i smoked it... (oh yeah!)
Bm (x24432@1)             Riff
 Rolled it up and sucked it. (oh yeah!)

Bm (x24432@1)                                A (x02220@1)Give me the goods so i can take it (oh yeah!)
Bm (x24432@1)                 Riff
 Give me the goods so i can take it (oh yeah!)

Bm (x24432@1)Woke up in the morning today,
A (x02220@1)What did i see?
Bm (x24432@1)I saw some coke saying:
Riff
 "come and sniff me!"
Bm (x24432@1)                       A (x02220@1)So i think i sniffed it... (**** yeah!)
Bm (x24432@1)          Riff
 Opened up and i whiffed it. (**** yeah!)

Bm (x24432@1)                                A (x02220@1)Give me the goods so i can take it (oh yeah!)
Bm (x24432@1)                Riff
 Give me the goods so i can take it (oh yeah!)
Bm (x24432@1)                               A (x02220@1)Give me the goods so i can take it (oh yeah!)
Bm (x24432@1)                Riff
 Give me the goods so i can take it (oh yeah!)

(Bm, A, Bm, Riff)xWhatever you like

Thats it...its pretty simple, but requires some practice to play it and sing it at 
the same time, so practice, but not too much...