Yes. Lemon is a great source of citric acid. DMT citrate is very water soluble (it's very hygroscopic and rapidly absorbs water directly from the air becoming a wet mess in seconds upon exposure to the air).

DMT fumarate is the least water soluble form of DMT known to me. That’s why it’s the only salt form known that is not hygroscopic.

A good oral dose of DMT fumarate will dissolve easily in a glass of water. Its less water soluble than DMT citrate, but still water soluble. When I said that its poorly water soluble, that’s in relation to the other popular salt forms (hydrochloride, tartrate, citrate, acetate, phosphate) which are all more water soluble.