Because it can be spread so many ways and is a common travel related illness, you will be strongly recommended to receive a hepatitis A vaccination before you travel to Bali.
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There are several risks with Bali's tap water:Additional bacteria that cause this condition include enteroinvasive E.coli (EIEC), enteroaggregative E.coli (EAEC), Shigella, Campylobacter, and Salmonella species.
Mosquito borne diseases found in Bali include dengue fever, chikungunya and zika virus. Whilst there are vaccines for Japanese encephalitis, mosquito avoidance is the only way to prevent many of these diseases.
The good news is that hepatitis B is vaccine preventable. This means that after you complete the vaccine series, you cannot contract hepatitis B through any modes of transmission; you are protected for life!