Rent is 1/2 month agent fee + 1 month deposit per year of contract (i.e. if u sign 2 years contract u need to prepare 1 month agent fee + 2 months deposit). Plus first month rental.

if u really cannot make the minimum sum average, there will be a penalty
depending on the bank, the minimum sum and penalty varies
for example
dbs/posb is sgd2, citibank is sgd10 for penalty
minimum sum is also different for banks....dbs/posb is 500 or 100, citibank is 5000 after 6 months (first 6 months no minimum sum), cimb does not have a minimum sum

u can always go for prepaid first
costs u a lot less

If you can negotiate a salary advance, or better yet... get the hiring company to provide temporary accommodation/moving costs or pay you a sign-on bonus - problem solved.

You might want to add moving costs (for yourself and your barang-barang) to your list. And first month expenses are always much higher... as you're running around looking for accommodation, getting your documents, medical check, buying necessities or white goods to set up yourself, open bank account, phone line, get to work early initially to make a good first impression etc... so you might want to budget for some of taxi rides, additional public transport trips or even bottles of water to drink when running around.

$300 for food? That's $10 a day... like you chap fan with no drinks every meal, every day (or one Big Mac meal each day). If you have a thing for coffee or cakes or junk food or have a sweet tooth or a girlfriend... you can safely double this amount.

Why bother with the details when you yet to land yourself a job in SG?

do note there here, banks do not share their atm like back in MY
so some banks, u may have problem withdrawing money.
just to let u know when considering
some companies also requires specific bank for salary...lol