Meal allowances vary every month, according to how many MCs and leaves you take. However it's usually around $120.
My ns pay is $750 (Basic) + $100 (NPCO Allowance) + $120 (Meal allowance) - $5 (Community Chest) - $5 (HTNS Membership) - Misc.
Bringing back about $950 per month.
For your info, BPT salary (SC without rank) should be $400 now. During my time, it was $350, then the Govt increased NS pay by $50.. So should be it.
Once you get your SC/Cpl rank, add another $70.
SC/Sgt after one year (counted from the day you enlisted), add a further $280.