A lovely song by Joni.  I hope the arrangement below gives you some idea how to time the chord changes 
to fit the lyrics - this is a simple arrangement that allows the voice to carry the melody

G                D
Just before our love got lost you said
Em
"I am as constant as a northern star"
             Am7                G
And I said, "Constantly in the darkness 
        D
Where's that at?
        D                     D
If you want me I'll be in the bar" 
G                D
On the back of a cartoon coaster
Em
In the blue of a TV screen light
Am7              G
I drew a map of Canada
   G      D      Em
Oh Ca  -  na  -  da
      Am7                       D
With your face sketched on it twice 

 
             C               Bm
Oh, you’re in my blood like holy wine
     C              G  
You taste so bitter and so sweet 
   G        G       G    D  Em                        
Oh I could drink a case of you, darling
     Am7                 D
And still I'd be on my feet
   D                   G
I would still be on my feet 

 
G            D        Em
Oh I am a lonely painter
Em
I live in a box of paints
Am7                    G                            
I'm frightened by the devil
          D
And I'm drawn to those ones that ain't afraid
G                D                                      
I remember the time you told me,
Em                                                          Am7
You said "Love is touching souls",  well surely you touched mine
  Am7                     G   D  Em
’Cause part of you pours out of me
   Am7                       D
In these lines from time to time 

 
            C               Bm
Oh, you’re in my blood like holy wine
     C              G  
You taste so bitter and so sweet 
   G        G       G    D  Em                        
Oh I could drink a case of you, darling
     Am7                 D
And still I'd be on my feet
   D                   G
I would still be on my feet 

G                        D                               Em
I met a woman, she had a mouth like yours, she knew your life
  Em          
She knew your devils and your dreams
          Am7              G
She said "Go to him, stay with him if you can
    D
But be prepared to bleed"

 
            C                     Bm
Oh, you’re in my blood, you're my holy wine
     C                G  
You taste so bitter, bitter and so sweet 
   G        G       G    D  Em                        
Oh I could drink a case of you, darling
     Am7                 D
And still I'd be on my feet
   D                   G
I would still be on my feet

来源：www.ultimate-guitar.com