​Follow the Rules
One of the main things is to trust the operators on the Instagram platform in the guidelines that they have set for you to operate within. Regulations are put in place to safeguard the company, you the general or verified account holder and the remaining online visiting public. Any breach of these guidelines may open any one of the mentioned entities to various forms of liability. If for some reason you the Instagram account holder ends up operating outside the scope of your regulations, this will affect your account as you are now in breach. The level of legal exposure may negatively affect your reputation and may even end a potential start-up or larger company. Allowing the regulations that have been put in place to work safeguards you from sometime bad publicity there is sometime unredeemable. 

Promote good products
It all comes down to bad press. Whether the product is tainted or the company managing the exposure will be important. The company or individual can manage its own response internally but an alignment to other companies or products that have been tainted can prove to be a task. Doing a bit of homework on your associates it very important as a bad situation may cause the demise of entities aligned to them. 

Get feedback
Keeping your ears on the ground is important in maintaining a good reputation. Hearing what is happening from onset of situations can put you ahead of whatever issue may be brewing from the early stages. Possible damage control may be necessary to mitigate the harm that bad reviews may have on your brand. Getting feedback from all facets of your business is important to promote good PR.  

Get help from Ad/PR consultants.
No one knows it all. Employing Advertizing or PR agencies to manage the image and response aspect of your Instagram account may not be such a bad idea. These persons are trained to respond to situations that may escalate if not approached properly. Image is everything in business and developing the right reputation can be a fragile process. The right thing being said at the wrong time may cause more issues than you ask for.
At the end of the day it is important for your reputation as a brand be managed properly. A misrepresentation of your product may affect you for years to come and may even kill your image before you start. Taking advice from even the regulators of the platform may save you some potential stress to do damage control. Some levels of bad publicity cannot be redeemed even with the best PR consultant.