Adding DMT freebase to any acidic solution (coke has phosphoric acid), will cause it to dissolve in the water as the DMT salt of the acid. Any aqueous solution of DMT will be good for oral consumption. So, using DMT in coke will produce a solution of DMT phosphate, DMT in OJ will produce a solution of DMT citrate, etc.
Many teks aim to produce DMT fumarate because it is the most stable form for storage, and can easily be dissolved in water and taken orally. It is also very easy to produce and collect using a solution in acetone.