Water won't drain from sink with garbage disposal

I swear I had a can opener, but I can not find it all in my kitchen! This can doesn't have a tab to open it, so I feel kind of stuck. Any household hacks to open this without making a mess?

I’m going nuts here. Every morning I wake up and find dozens of ants wandering around in my kitchen and living room. It doesn’t seem to matter how many traps I set out or how deep I clean my home to get rid of food scraps or whatever the ants seem to be after. Does sugar water get rid of ants? I feel like I heard something like that somewhere but I have no clue if any of that stuff actually works. What will actually solve this problem? I don’t even hate ants like that, but leave my living space alone, ya know?

I am losing my mind. I've had bedbugs in my house for a week and nothing seems to be getting rid of them. How do I kill them? Do I just need to bite the bullet and call an exterminator? Do I need to move???? I'm pulling my hair out as we speak. Help, please!