The inside of a balloon is not sound proof because it isn't a vacuum.
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Balloons are not soundproof. While they can absorb some sound, they are not designed to block or reduce noise significantly. Sound can still travel through the latex material of a balloon.
To soundproof walls, you can add mass by using dense materials like drywall or mass-loaded vinyl, seal any gaps and cracks with acoustical caulk, and add sound-absorbing materials like acoustic panels or foam. You can also consider adding an extra layer of drywall with green glue sandwiched in between for additional soundproofing.
Things that can go "pop" include balloons, bubble wrap, popcorn kernels, and the sound made by opening a bottle of champagne.
Water balloons are typically made of thinner material than latex balloons, so they can hold less air in comparison. Also, water balloons are designed to hold water, not air, so they may burst if overinflated with air. Latex balloons are designed specifically for holding air and can typically hold more air than water balloons.
Rubber balloons are more porous than plastic balloons, so they allow air to slowly escape through the surface more easily. This makes rubber balloons deflate faster compared to plastic balloons, which have a tighter seal and are less permeable to air.
You can get helium balloons filled at party supply stores, grocery stores, or stores that specialize in balloons and party decorations.