I’m not sure if this will help you but I found this list of possible hay sources in the Philippines on a guinea pig blog:
http://pandaloki.blogspot.com/p/where-to-buy-guinea-pig-stuff.html
It also might be worth calling and asking around places that deal with horses if they know where to get hay. Hay is 80-90% of a rabbit’s diet so it’s pretty important.
I don’t know about a baby rabbit being pellet free so hopefully someone else here can comment on that. I do know that adult rabbits on pellet free diets require a very wide variety of raw greens (12-15 different raw veggies a day) in large quantities to make sure they’re rabbits get all the necessary vitamins and minerals that pellets provide.
Looking over your previous post is says you feed cooked carrots and kang kong. I would avoid feeding cooked carrots, if you’re feeding carrots they should be raw (and fed sparingly as they’re high in sugar). Another thing to consider is the amount of Kang Kong you feed. According to the House Rabbit Society in Singapore “Kang Kong should be fed sparingly due to being high in either oxalates or goitrogens and may be toxic in accumulated quantities over a period of time.”
http://www.hrss.net/aar/care/care_diet_faq.html
Here is another safe veggies list with more stuff:
http://www.rabbit.org/care/veggies.html
The second one mentions cabbage and that it should be fed in smaller quantities (Only 15% of daily greens).
I think Carabao grass is safe for a bunny.
I’m not sure what is readily available in the Philippines but hopefully some of this helped a little.