Argentina is a modern country with good health and dental services. Sanitation and hygiene at restaurants is relatively high, and tap water is generally safe to drink throughout the country. If you want to make sure, ask โยฟSe puede tomar el agua de la canilla?โ (Is the tap water drinkable?).
According to the CDC tap water is generally not safe for consumption.
According to the Numbeo water drinkability and accessibility index, tap water has a score of 70.68 / 100 (100 being best).
Numbeo considers this score to be "High"
1 adult could save about 664$ per year in Argentina by drinking tap water instead of buying bottled water.
๐ณ Drinking tap water would also help with reducing your plastic footprint and improve environmental pollution.
Like in most countries, water quality and accessibility differs from location to location, therefore it's the best to check the information available on that place.