1. there are many types of pre-packed baby food sold in sg that can be heated up using hot water or microwave. you can even offer food from there like eg scrambled eggs? I’m sure perth has baby food sold there.
2. lots of quiet toys, if you search online there are many recommendations. even simple things like post its can also be fun for them to peel.
3. wear kids thermal inner wear - uniqlo has them.