I have strong opinions about coffee. Read them at your own risk.
1. Instant coffee is not coffee. It's a coffee like flavored drink.
2. Chicory ruins coffee.
3. Only 100% Arabica. Robusta is not coffee.
4. Coffee should be like your woman's heart. Dark and bitter. Milk and sugar ruins it.
5. Beans must be ground fresh and consumed same day.
6. 15 bar espresso machine is must. But mokka pot/ French press/ aeropress is also ok, for a different type of taste.
To answer your questions, Blue Tokai, IKEA house brands are good. Starbucks is same thing for more money.
Never grind coffee beans in a normal mixie. A burr grinder is a worthwhile investment.
If you must buy instant, get Nescafe Gold region specials like Cap Columbi or Alta Rica. Davidoff is also not bad. Amazon sells them much cheaper.