From the Jain point of view, if it is absolutely necessary to take medicine on a fasting day, taking a very small amount of water with it is considered permissible in many situations, because more emphasis is placed on ahimsa and on protecting the body than on observance alone. However, the rules of Sādhāporasi may differ slightly according to different traditions or acharya lineages. Therefore, if you have taken the vow under a guru’s specific rule, then follow that rule exactly.

In short: In an emergency, taking water with medicine is often considered permissible. Not by desire, but only when truly needed. If there is a special pledge in your vow, then keep that pledge. In Jain dharma, a balance is maintained between avoiding हिंसा and preserving dharma.