Answer

In the usual Jain tradition, an electrolyte drink is generally not allowed during ayambil.

Explanation

Ayambil is meant to be a very simple and restrained vow. It normally allows:

• one plain cooked meal
• without ghee, oil, sugar, jaggery, honey, milk products, or strong spices
• and usually plain water

An electrolyte drink usually contains:

• salt
• sugar or sweeteners
• flavoring or added minerals

Because of this, it does not fit the strict simplicity of ayambil.

Spiritual Understanding

Ayambil is practiced to reduce attachment to taste and comfort. The purpose is not only fasting, but also inner discipline, simplicity, and purification. Even a small flavored drink can go against that spirit in a strict observance.

Takeaway

If you are observing ayambil strictly, avoid electrolyte drinks. If there is a health need, it is best to follow the guidance of your guru, sadhviji, or local sangh.