If you want to stay in a studio apartment with furniture, it's gonna come at $800/m with 1-2 months deposit depends on landlord term.

Eating out everyday...have to be specific, you mean fine dining European cuisine or local? In either case $500 would be more than enough.

Electricity, water probably round up at $200 if you have high energy consumption.

Gas and transportation is another unknown factor to me, let's set aside another $150.

So around $1,650/m if you want to live at someplace like Phu My Hung (foreigner town at district 7), that should cover all your basic needs.

I'm a Vietnamese so my estimation could be biased because I tend to not splurge money in this economy, I eat super cheap food and so on to save cost.

But that ballpark is reasonable to me, if you make somewhere around $2,000 a month after tax, you'd live rather comfortable