Solo in India, how safe is it?

I'm in the middle of planning a trip for this summer, and while I was looking at airfare I found a good price for Delhi. Now this will not be my first time traveling overseas, nor will it be my first time traveling solo. Looking at the state department it advises against traveling alone there but I want to do a bit of my own research on the matter. Here is what I already know about dangers in India:

• It's very easy to get food poisoning

• Do not drink the water

• Do not get food from street vendors

• Do not flash cash or expensive electronics

• Scams and petty theft are common in tourist areas

• Rape is also a risk mostly for female travelers (which I'm not)

Is there anything more I should consider in terms of safety? Like should there be anything to look out for when using public transit or taxis? How can I tell if a brick and mortar restaurant is safe to eat at?

If I do decide on going I most likely won't be leaving Delhi.