From Booth's Record of Louisiana Confederate Soldiers...

Pratt, J. H.
Private, Company C
19th Louisiana Infantry

Appears on Roll for May and June, 1862, dated Aug. 22, 1862 (only Roll on file) Enlisted May 14, 1862 Monroe, La. Died Aug. 22, 1862.
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I also found this...

Louisiana Secretary of State
Confederate Pension Applications Index Database
Selected Name Detailed Data

Reel: CP1.112 -- Microdex 4 -- Sequence 8
Target card: PRATT, NANCY P. (HARDING)

Applicant Information & Name Variations:

PRATT, NANCY P. (HARDIN)
Parish: UNION -- Pages: 4

Soldier Information & Variations:

PRATT, JACOB H.
State: LA
Branch: INFANTRY
Unit: 19TH REGIMENT
Company: CO. C

PRATT, JOAB H.
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If this is your man it appears his wife didn't remarry. I suggest ordering his Compiled Service Record and his spouse's Confederate pension application. You can do this and help support this board at the same time by using our Military Records Research Services. Just click on this address...

http://history-sites.com/research/index.html

P.S. ___ Do you have a photo of the canteen you are in possesion of? If so that would help identify it. If you do, and want to post it here just let me know.