Go to your local home center. Explain the problem and the type of toilet you have.
You need at least a new flapper on all of your toilets, and possibly new fill valvew. Toilet rebuild kits are not that expensive. The rebuild kits come with instructions.
If you are somewhat handy, the work is really not that difficult. If you are not handy, hire a plumber. Leaking toilets can cost several hundred dollars per month in both water and sewer bills!
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