Ford 1996 Bronco Manual page 309

If the level gets low, you can add tap water to
the battery, provided the water isn't hard or
doesn't have a high mineral or alkali content.
However, if possible you should refill the battery
with distilled water. If the battery needs water
quite often, have the charging system checked
for a possible malfunction.
Help Us Protect Our Environment
Ford Motor Company strongly recommends that
used lead-acid batteries be returned to an
authorized recycling facility for disposal.
Battery recycling symbol
Batteries normally produce explosive gases
which can cause personal injury.
Therefore, do not allow flames, sparks or
lit tobacco to come near the battery. When
charging or working near a battery, always
cover your face and protect your eyes, and
also provide ventilation.
Batteries contain sulfuric acid which burns
skin, eyes, and clothing.
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