Product/(s) of the following reaction I was wondering what the product will be in the following reaction:
$$\ce{H3COOCH3 -&gt;[\ce{H+}]} \:?$$

I was thinking about $\ce{CH3COOH}$  being a product but I do not know the mechanism.
If you're sure that the initial formula is $\ce{H3COOCH3}$ (and that's a big if), then I disagree with Richard's answer in comments. $\ce{H3COOCH3}$ is dimethyl peroxide. While peroxides are not the most stable of molecules, and decompose rapidly (often by oxidizing other compounds), they do not spontaneously transform in acid conditions.

If the formula were $\ce{H3C–COOCH3}$ (note the added C), then yes, it's be acid-catalysed ester hydrolysis.