Answer

A kevali is an omniscient being in Jainism, but whether a kevali eats or drinks is a sect-wise difference. In Digambara tradition, a kevali does not eat or drink; in Śvetāmbara tradition, a kevalin may continue taking food and drink until final nirvāṇa, without attachment or karmic bondage. ( jainpedia.org)

Explanation

A kevali is one who has attained kevala-jñāna, or omniscience, and is still in the body. Jain texts and later tradition describe this state differently across sects, especially on the question of bodily needs like hunger and thirst. ( jainpedia.org)

Spiritual Understanding

The deeper Jain point is that a kevali has completely conquered inner passions. So even where food and drink are accepted in Śvetāmbara understanding, it is not out of desire or attachment. In Digambara understanding, the kevali has transcended eating and drinking altogether. ( jainpedia.org)

Takeaway

So the simple answer is: there is no single answer for all Jain traditions. Digambara says no; Śvetāmbara says yes, until nirvāṇa. ( dokumen.pub)