Yes, you need baking soda, another common name is bicarbonate of soda, selling for $1 at NTUC, sugar is normal fine sugar.
Personally, I can't get my plants to bubble using DIY CO2 but after getting a CO2 set, my plants bubbles a lot. Highly recommended if you are really into planted tank. The 2.3l cylinder is not really that big and heavy. Can carry with one hand. YOu can drop by at Nature to have a look. The 5l tank is bigger and heavy, have to carry with both hand. That one will last for 1 year.
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