See for example Need to make an airtight rocket without Glue, Tape, etc. How?.
OP even admits they need this "for school", i.e. it's obvious homework.
Other sites in Stack Exchange prohibit homework questions, but not all.
What should we do here with such questions? Personally I have a feeling they should be closed, but not part of the "core" of this site, it's not my decision to make.