I'll have a cup of oat meal and a couple slices of toast and maybe 3 hard boiled eggs for breakfast, then some rice and a can of tuna next meal, maybe a chicken salad with some chips and salsa for lunch, then another rice/tuna meal, and for dinner I just have whatever the lady makes which is usually pretty balanced, then I have a good size snack before bed, like 20 pizza rolls

hehe I know not the best but damn it is good.
For drinks I am big on milk and water, I usually have some oj if I drink something else.
I know it's not the main thing, but also keep in mind, a few weeks ago I was 163, hardly ate anything besides chips and salsa lol and hadn't touched a weight in years, so I weighed in at 181 this morning after I took a leak no food, nothing, just my natural early morning weight so I think I am on the right track, I've put on some body fat but I don't have a belly or anything.
Do you think it would be bad to maybe drink more water at one time and try to stretch my stomach a little? I know eating competition guys will down 1 gallon straight to do this, I am not doing that, but maybe adding more water with my meal will fill my stomach but not fill me the same as a ton of food, the cup of rice and can of tuna is like 30 something grams of protein and 700 something calories, is 700 calories too much for one meal?
I'm 5'9, 181lbs, just a beginner bodybuilding, what should my ideal calorie intake be?